Hazard Plain Automated baseline

Bannock County, ID

Risk-assessment baseline packet

County FIPS:
16005
Release:
2026-10
Data as of:
2026-09-30
Storm Events data through:
2026-06-30

Hazard Plain is an independent product built from public federal data. It is not a FEMA document and is not reviewed or endorsed by FEMA or any state agency.

Hazard Plain release 2026-10, as of 2026-09-30.

Summary

Plan status as of 2026-09-30: Approved, expires 2027-01-02. Plan: Bannock County (FEMA plan 107850), approved 2022-01-03.

Since the plan was approved on 2022-01-03: no new federal declaration.

NOAA Storm Events records since that date: 149 records (data through 2026-06-30).

Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Wildfire ($8,582,941 a year), Inland Flooding ($8,427,766) and Cold Wave ($7,556,100).

Repetitive-loss flood properties now: FMA RL 0, SRL 0 (44 CFR 77.2); any definition: 1.

The tables that follow are organized by the items of FEMA's Local Mitigation Plan Review Tool, Element B (B1-a to B2-c); each heading says which item its tables support.

Plan clock

Status:
Approved, expires 2027-01-02
Plan:
Bannock County (FEMA plan 107850)
Approved:
2022-01-03
Days to expiry:
94
Update underway:
none recorded in FEMA's plan tracker

What changed since your last plan (approved 2022-01-03)

New federal declarations:
none
Storm Events records since approval:
149 records (data through 2026-06-30)
Repetitive loss now:
FMA RL 0, SRL 0 (44 CFR 77.2); any definition: 1
Repeat-flood change:
this release sets the baseline count.

Sources: 1, 2, 4, 6 (numbered list at the end)

Plan status for every jurisdiction listed in this county

Source: 1

JurisdictionTypeStatusPlanApprovedExpiresDays to expirynegative = days since expiry
Bannock CountyCountyApproved, expires 2027-01-02Bannock County (FEMA plan 107850)2022-01-032027-01-0294
Chubbuck cityCityApproved, expires 2027-01-02Bannock County (FEMA plan 107850)2022-01-032027-01-0294
Inkom cityCityApproved, expires 2027-01-02Bannock County (FEMA plan 107850)2022-01-032027-01-0294
Lava Hot Springs cityCityApproved, expires 2027-01-02Bannock County (FEMA plan 107850)2022-01-032027-01-0294
McCammon cityCityApproved, expires 2027-01-02Bannock County (FEMA plan 107850)2022-01-032027-01-0294
Pocatello cityCityApproved, expires 2027-01-02Bannock County (FEMA plan 107850)2022-01-032027-01-0294

State plan status and tribal plans in this state: see the state page.

Supports FEMA checklist item B1-a: hazard identification

Hazards NRI does not cover (local data needed)

  • dam failure (incl. upstream dams)
  • levee failure
  • flash flood as its own subtype
  • ice jams
  • debris flows
  • erosion (riverine and coastal)
  • land subsidence and sinkholes
  • expansive soils

The 18 National Risk Index hazards, ranked by expected annual loss (EAL)

Sources: 5, 6

Rank by EALHazardNRI risk ratingEAL ratingEAL buildingsmodeled dollars per yearEAL agriculturemodeled dollars per yearCost of expected deaths and injuriesFEMA's dollar value per year, not property damageEAL total (see note)modeled dollars per yearStorm Events records, 1996 to 2026-06-30countWhy this hazard can be left outNRI Not Applicable, no declaration and no Storm Events record since 1996Storm Events coverage note
1WildfireRelatively ModerateRelatively High$8,005,044$1,007$576,891$8,582,94127
2Inland FloodingRelatively LowRelatively Low$8,410,101$13,059$4,606$8,427,76662
3Cold WaveRelatively ModerateRelatively High$7,427$25,877$7,522,796$7,556,1006
4EarthquakeRelatively LowRelatively Low$2,002,753n/a$638,627$2,641,380Storm Events does not record earthquakes.
5Heat WaveRelatively ModerateRelatively Moderate$131$2,898$1,718,463$1,721,4924
6Winter WeatherRelatively HighVery High$3,842$19$993,276$997,137105Includes 1 Sleet record (outside NRI's Winter Weather definition).
7LightningRelatively ModerateRelatively Moderate$75,390n/a$794,508$869,89812
8HailRelatively LowRelatively Low$196,087$499$20,640$217,22771
9TornadoVery LowVery Low$116,758$169$59,754$176,6813
10Strong WindVery LowRelatively Low$52,632$320$70,230$123,182115Includes 22 High Wind records (a NOAA non-thunderstorm wind type, outside NRI's Strong Wind definition).
11Ice StormVery LowVery Low$14,073n/a$5,935$20,0080No recorded events in Storm Events since 1996 (data through 2026-06-30).
12LandslideVery LowVery Low$1,662n/a$1,281$2,9420No recorded events in Storm Events since 1996 (data through 2026-06-30).
13DroughtVery LowVery Lown/a$1,428n/a$1,4280No recorded events in Storm Events since 1996 (data through 2026-06-30).
14Volcanic ActivityVery LowVery Lowunder $1n/a$99$990No recorded events in Storm Events since 1996 (data through 2026-06-30).
15AvalancheVery LowVery Low$0n/a$64$641
HurricaneNot ApplicableNot Applicable0NRI rates hurricane Not Applicable for this county, and no counted federal declaration for this county names it (EM-3244-ID names it but is not counted as a local occurrence; see B1-d).No recorded events in Storm Events since 1996 (data through 2026-06-30).

Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).

NRI risk rating combines expected annual loss with social vulnerability and community resilience; EAL rating rates expected annual loss alone. Both compare this county with all U.S. counties.

Local data needed: state and local landslide and volcanic activity records (Storm Events records these hazards only in part).

Not applicable to this county per NRI, with no federal declaration and no Storm Events record since 1996: coastal flooding and tsunami. That is the evidence for leaving them out of the plan.

The state hazard mitigation plan also lists hazards for this county; FEMA asks the plan to explain any hazard it leaves out.

Supports FEMA checklist item B1-b: hazard location

Affects the whole county (national data give no location within it): Cold Wave, Drought, Hail, Heat Wave, Ice Storm, Lightning, Strong Wind and Winter Weather.

Inland Flooding: The FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county.

Hazards that vary within the county: highest-rated census tracts

Source: 5

HazardHighest-rated census tractsNRI risk rating, score 0 to 100
Avalanchetract 9400 (Very Low, 14.6); tract 19 (Very Low, 12.5); tract 6 (Very Low, 11.5)
Earthquaketract 14 (Relatively Moderate, 86.3); tract 19 (Relatively Moderate, 83.2); tract 7 (Relatively Moderate, 81.8)
Hurricaneno tract has a National Risk Index rating for this hazard
Landslidetract 19 (Relatively Low, 94.8); tract 2 (Relatively Low, 91.0); tract 9818 (Very Low, 75.7)
Tornadotract 7 (Relatively Low, 30.4); tract 15 (Very Low, 28.3); tract 14 (Very Low, 26.4)
Volcanic Activitytract 15 (Very Low, 83.2); tract 4 (Very Low, 81.2); tract 14 (Very Low, 80.6)
Wildfiretract 19 (Very High, 99.6); tract 2 (Very High, 99.5); tract 6 (Relatively High, 99.0)

Up to 3 census tracts per hazard, highest National Risk Index rating first, then highest score; a tract number is the Census tract number (for example 9400 is Census Tract 9400). FEMA's Resilience Analysis and Planning Tool maps the National Risk Index for every tract: https://www.fema.gov/emergency-managers/practitioners/resilience-analysis-and-planning-tool

Supports FEMA checklist item B1-c: hazard extent

Extent: scale, observed range and worst recorded event per hazard

Sources: 6, 7

HazardScaleRecordscount and yearsObserved rangeWorst recorded eventMost damaging (when different)How it applies to jurisdictionsNote
Avalanchenone (count and damage only)1 record, 2020 (1 zone-level)No damage reported in 1 record.Countywide (zone-level records).Physical measure: in event narratives only (local data needed).
Cold/Wind Chill, Extreme Cold/Wind Chillwind chill6 records, 2019 to 2025 (6 zone-level)1 day to 31 days (median 2.5 days); 6 with a recorded valueOctober 2019 (1 monthly summary record), zone-levelCountywide (zone-level records).Wind chill: in event narratives only (local data needed).
Frost/Freeze (outside NRI's Cold Wave definition)crop damage0Temperature: in event narratives only (local data needed).
DroughtU.S. Drought Monitor scale (D0 to D4)0Storm Events enters a drought at D2 or worse east of the Rockies and D3 or worse from the Rockies west (NWS Instruction 10-1605); NRI drought counts D3 and D4 only.
EarthquakeModified Mercalli (local data)0Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hailhail size (inches)80 records, 1958 to 20250.75 in to 2 in (median 1 in); 80 with a recorded value2 in hail, 2015-06-01Hail, 1997-08-12, $1,040,000 property; crops not reported (1997 dollars)Event records naming jurisdictions in the plan: Pocatello city (34 records), Chubbuck city (16 records), Inkom city (9 records), Lava Hot Springs city (2 records).
Excessive Heat, Heatheat index (in event narratives)4 records, 2020 to 2026 (4 zone-level)1 day to 30 days (median 30 days); 3 with a recorded valueSeptember 2022 (1 monthly summary record), zone-levelCountywide (zone-level records).Heat index: in event narratives only (local data needed). Heat records from November to March (unseasonable warmth, not a heat wave) are counted but not used for the longest run.
Hurricane, Tropical Storm, Tropical DepressionSaffir-Simpson0Storm Events files every zone of a storm's episode under the storm's type; flooding from the storm is filed as Flood or Flash Flood records.
Ice StormSperry-Piltz ice scale (local data)0Ice thickness: in event narratives only (local data needed).
Flash Flood, Flood, Lakeshore Flooddamage and flood days (flood depth: FIRM)62 records, 1997 to 2025Flash Flood, 2013-09-03, $700,000 property; $0 crops (2013 dollars)Event records naming jurisdictions in the plan: Pocatello city (40 records), Inkom city (10 records), Chubbuck city (8 records), Lava Hot Springs city (1 record).Flood depth: see the FEMA Flood Insurance Rate Map. Storm Events damage is often $0 or blank for floods, major ones included; FEMA Public Assistance by declaration (B1-d) shows which floods cost the most.
Debris Flownone (count and damage only)0Physical measure: in event narratives only (local data needed).
Lightningannualized frequency (the measure FEMA's Local Mitigation Planning Handbook names)12 records, 1996 to 2024Lightning, 1997-06-17, $1,000,000 property; crops not reported (1997 dollars)Event records naming jurisdictions in the plan: Pocatello city (7 records), Chubbuck city (4 records), Inkom city (1 record).Storm Events lists lightning with damage or casualties; physical measure in event narratives only (local data needed).
High Wind and Strong Wind (outside NRI's Strong Wind definition)wind speed (kt and mph)22 records, 2020 to 2026 (22 zone-level)50 kt (58 mph) to 67 kt (77 mph) (median 53 kt (61 mph)); 22 with a recorded value67 kt (77 mph) measured gust, High Wind, 2025-12-17; NWS zone IDZ058High Wind, 2025-12-17, $700,000 property; $0 crops, reported for the zone (2025 dollars)Countywide (zone-level records).
Thunderstorm Windwind speed (kt and mph)112 records, 1955 to 202643 kt (49 mph) to 72 kt (83 mph) (median 52 kt (60 mph)); 98 with a recorded value72 kt (83 mph) measured gust, Thunderstorm Wind, 2025-12-17Thunderstorm Wind, 2006-03-25, $100,000 property; crops not reported (2006 dollars)Event records naming jurisdictions in the plan: Pocatello city (47 records), Chubbuck city (27 records), Lava Hot Springs city (6 records), Inkom city (3 records).
TornadoEnhanced Fujita (Fujita before Feb 2007)6 records, 1983 to 2007F/EF0 to F/EF1 (median F/EF0); 6 with a recorded valueF1 tornado, 1983-08-18, 2.5 mi path length (whole path, pre-1996), 3 yd wide, $30 property; crops not recorded (1983 dollars)Tornado, 2000-02-14, $110,000 property; crops not reported (2000 dollars)Event records naming jurisdictions in the plan: Chubbuck city (1 record), Inkom city (1 record), Pocatello city (1 record).Before 1996 a tornado is listed once, under the county where it began, with its whole path's rating and length; from 1996 on, each county lists its own segment. Length is not used to rank tornadoes (see Methods).
Volcanic Ash, Volcanic AshfallVolcanic Explosivity Index (local data)0Physical measure: in event narratives only (local data needed).
Wildfireacres burned (local data)27 records, 2000 to 2026 (22 zone-level)Wildfire, 2003-07-21, $500,000 property; crops not reported (2003 dollars)Event records naming jurisdictions in the plan: Pocatello city (2 records), Lava Hot Springs city (1 record). Zone-level records (22) apply countywide.Acres burned: in event narratives only (local data needed).
Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleetnone in data (snowfall: local data)105 records, 2018 to 2026 (105 zone-level)Winter Storm, 2024-03-01, $190,000 property; $0 crops (2024 dollars); NWS zone IDZ054Countywide (zone-level records).Snow depth: in event narratives only (local data needed).

Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records whose zone no NWS zone-county file places in this county (mostly before 2020) are not counted here (the Methods page explains the zone matching).

Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.

A monthly summary record covers most or all of a month; it does not count days at wave conditions.

Supports FEMA checklist item B1-d: previous occurrences

Federal declarations for this county: 5 declarations covering 2 separate hazard incidents counted in this packet (declarations for the same incident count once; non-natural and evacuation-only declarations are not counted).

Federal disaster declarations for this county

Sources: 1, 2, 3

DeclaredIncident beganFEMA numberTypeTitleMapped hazardCounty Public Assistancefederal share obligated, nominal dollarsNotes
2020-04-092020-01-20DR-4534-IDMajor disasterCOVID-19 PandemicNon-natural, not counted$248,633.07
2020-03-132020-01-20EM-3467-IDEmergencyCOVID-19Non-natural, not countedno Public Assistance recordedsame incident as DR-4534
2005-09-132005-08-29EM-3244-IDEmergencyHurricane KatrinaHurricane: evacuation support, not a local hazard event; not countedno Public Assistance recorded
2000-09-012000-07-27DR-1341-IDMajor disasterWildfiresWildfirePA not declared for this county
1964-12-311964-12-31DR-186-IDMajor disasterHeavy Rains & FloodingInland Floodingno Public Assistance recorded

County Public Assistance: applicants the FEMA record places in this county, including any state agencies FEMA files there; statewide rows are listed on the state page; federal share obligated, nominal dollars.

Statewide declarations

Source: 2

DeclaredIncident beganFEMA numberTypeTitleMapped hazard
1963-02-141963-02-14DR-143-IDMajor disasterFloodsInland Flooding
1962-02-141962-02-14DR-120-IDMajor disasterFloodsInland Flooding
1961-06-261961-06-26DR-116-IDMajor disasterFloodsInland Flooding
1960-07-221960-07-22DR-105-IDMajor disasterFiresWildfire
1957-05-271957-05-27DR-76-IDMajor disasterFloodInland Flooding
1956-04-211956-04-21DR-55-IDMajor disasterFloodsInland Flooding

FEMA recorded these with designated area Statewide and no county, so they are listed on every county page in the state and not counted with county rows. Local data needed: whether each one affected this county.

2 Fire Management declarations (1977-08-20 to 1979-08-08) FEMA filed as Statewide with no county; each names one local fire. Listed on the state page.

Public Assistance not placed in any Idaho county: 1 row, $107,969.35; listed on the Idaho state page.

Source: 3

Previous occurrences by hazard, with explicit no-event rows

Sources: 2, 6, 7

HazardStorm Events records, all years on file(years in the Period column)Since plan approvalrecordsIn the 12 months before plan approvalrecordsLast 5 yearsrecordsDeclared incidents, all yearsseparate disastersDeclared since approvalseparate disastersPeriodStatement
Avalanche1000001996 to 2026-06-30
Cold Wave6404001996 to 2026-06-30
Drought0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Earthquake000000Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hail80919001955 to 2026-06-30
Heat Wave4212001996 to 2026-06-30
Hurricane0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Ice Storm0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Inland Flooding62606101996 to 2026-06-30
Landslide0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Lightning12202001996 to 2026-06-30
Strong Wind13456657001955 to 2026-06-30Includes 22 High Wind records.
Tornado6000001950 to 2026-06-30
Volcanic Activity0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Wildfire2711311101996 to 2026-06-30
Winter Weather105591065001996 to 2026-06-30Includes 1 Sleet record.

Notable Storm Events records

Sources: 1, 6, 7

DateEvent typeMagnitude or extentDamagenominal dollarsDeaths, injuriesdirect onlyLocationFlagsWhy listed
2025-12-17High Wind67 kt (77 mph) measured gust$200,000 property; $0 crops, reported for the zone (2025 dollars)0, 0NWS zone IDZ058 (MARSH AND ARBON HIGHLANDS), zone-levelnew since last plan; within last 5 yearsB1-c worst recorded: High Wind and Strong Wind
2024-03-01Winter Storm$190,000 property; $0 crops, reported for the zone (2024 dollars)0, 0NWS zone IDZ054 (LOWER SNAKE RIVER PLAIN), zone-levelnew since last plan; within last 5 yearsB1-c worst recorded: Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet
2022-09-01Excessive Heat$0 property; $0 crops, reported for the zone (2022 dollars)0, 0NWS zone IDZ054 (LOWER SNAKE RIVER PLAIN), zone-levelnew since last plan; within last 5 yearsB1-c worst recorded: Excessive Heat, Heat
2022-01-23Extreme Cold/Wind Chill$0 property; $0 crops, reported for the zone (2022 dollars)1, 0NWS zone IDZ054 (LOWER SNAKE RIVER PLAIN), zone-levelnew since last plan; within last 5 yearsdeaths or injuries recorded
2020-10-23Cold/Wind Chill$0 property; $0 crops, reported for the zone (2020 dollars)1, 0NWS zone IDZ054 (LOWER SNAKE RIVER PLAIN), zone-leveldeaths or injuries recorded
2020-03-15Avalanche$0 property; $0 crops, reported for the zone (2020 dollars)1, 0NWS zone IDZ058 (MARSH AND ARBON HIGHLANDS), zone-leveldeaths or injuries recorded
2019-10-01Extreme Cold/Wind Chilldamage not reported0, 0NWS zone IDZ054 (LOWER SNAKE RIVER PLAIN), zone-levelB1-c worst recorded: Cold/Wind Chill, Extreme Cold/Wind Chill
2015-06-01Hail2 in$0 property; $0 crops (2015 dollars)0, 0CHUBBUCKB1-c worst recorded: Hail
2013-09-03Flash Flood$700,000 property; $0 crops (2013 dollars)0, 0CHUBBUCKB1-c worst recorded: Flash Flood, Flood, Lakeshore Flood
2003-07-21Wildfire$500,000 property; crops not reported (2003 dollars)0, 0MC CAMMONB1-c worst recorded: Wildfire
1997-06-17Lightning$1,000,000 property; crops not reported (1997 dollars)0, 0POCATELLOB1-c worst recorded: Lightning
1983-08-18TornadoF1, 2.5 mi path length (whole path, pre-1996), 3 yd wide$30 property; crops not recorded (1983 dollars)0, 0location not recordedB1-c worst recorded: Tornado

The full list is in the Excel file, sheet "B1-d Storm Events history" (437 rows).

Location is the place NOAA recorded, as written in its data; it need not be a jurisdiction in this plan.

Local data needed: state-declared emergencies, from your state emergency management agency (federal data do not include them).

Tribal and special-area declarations in this state are listed on the state page.

Supports FEMA checklist item B1-e: probability of future events

Probability: FEMA annualized frequency and descriptor per hazard

Sources: 5, 6

HazardFEMA annualized frequency (modeled)unit per rowUnitIn plain termsDescriptorDescriptor basisNRI events or days in its record period (hail, wind and tornado are area-weighted, so can be fractional)NRI periodLocationNote
Avalanche0.01events per yearabout 1 in 100 yearsPossibleFEMA annualized frequency (modeled)01994 to 2023 (30 years)see B1-f0.01 is NRI's minimum avalanche frequency for a county in an avalanche susceptibility zone; NRI records no avalanche here, so the descriptor reflects the floor, not local events.
Cold Wave0.882event-days per yearabout 0.882 days per yearLikely (from Storm Events: 5 of 30 years)event-days in 5 of 30 years, 1996 to 2025 (16.7%)16.92005-11-12 to 2024-11-12 (19 years)countywide
Drought67.5event-days per yearabout 67.5 days per yearevent-days in 0 of 30 years, 1996 to 2025 (0%)2,0792000 to 2025 (25.25 years; D3 and D4 only)countywideNo Storm Events drought record, 1996 to 2025
Earthquake0.0108annual probability at a locationchance a given location in the county has at least minor-damage shaking in a year: 1.08%not shownmodeledsee B1-fNo descriptor (Storm Events does not record earthquakes).
Hail0.423events per yearabout 1 in 2 yearsLikelyFEMA annualized frequency (modeled)16.1 (modeled)1986 to 2023 (38 years)countywide
Heat Wave2.07event-days per yearabout 2.07 days per yearLikely (from Storm Events: 3 of 30 years)event-days in 3 of 30 years, 1996 to 2025 (10%)34.52005-11-12 to 2024-11-12 (19 years)countywide
Hurricaneevents per year1851 to 2024 (Atlantic)see B1-fNot Applicable in NRI for this county; no descriptor.
Ice Storm0.0149event-days per yearabout 0.0149 days per yearevent-days in 0 of 30 years, 1996 to 2025 (0%)01946-12-31 to 2014-02-12 (67 years)countywideNo Storm Events ice storm record, 1996 to 2025
Inland Flooding1.86event-days per yearabout 1.86 days per yearLikely (from Storm Events: 19 of 30 years)event-days in 19 of 30 years, 1996 to 2025 (63.3%)521996 to 2023 (28 years)see B1-f
Landslide1.19events per year (modeled)about 1.19 per yearHighly likelyFEMA annualized frequency (modeled)not shownmodeledsee B1-f
Lightning33.4days per year with a strikeabout 33.4 days per yearHighly likelyFEMA annualized frequency (modeled)not shown1995 to 2023 (29 years; CONUS)countywide
Strong Wind0.748events per yearabout 0.75 per yearLikelyFEMA annualized frequency (modeled)291986 to 2023 (38 years)countywide
Tornado0.115events per yearabout 1 in 9 yearsLikelyFEMA annualized frequency (modeled)not shown1950 to 2023 (EF2+); 1986 to 2023 (EF0-1)see B1-f
Volcanic Activity0.0005annual probabilityabout 1 in 2,000 yearsUnlikelyFEMA annualized frequency (modeled)not shownmodeledsee B1-f
Wildfire0.0137annual probability at a locationchance a given location in the county burns in a year: 1.37%Likely (from Storm Events: 10 of 30 years)Storm Events records in 10 of 30 years, 1996 to 2025 (33.3%)not shownmodeledsee B1-fDescriptor from Storm Events, not NRI.
Winter Weather24.2event-days per yearabout 24.2 days per yearLikely (from Storm Events: 8 of 30 years)event-days in 8 of 30 years, 1996 to 2025 (26.7%)4542005-11-12 to 2024-11-12 (19 years)countywide

FEMA annualized frequency (modeled) is the National Risk Index v1.20 (December 2025) estimate of how often a hazard affects this county in a year; it is not recorded events divided by years, and its unit differs by hazard (events, event-days, or days with a lightning strike per year). For earthquake, wildfire, coastal flooding and tsunami the value is the chance (or number of events) at a location in the county, not across the county, so no "1 in N years" is given and the descriptor comes from Storm Events where it has a record (none for earthquake). The Methods page gives each hazard's method, from FEMA's National Risk Index Technical Documentation v1.20.

Where NRI gives event-days, the descriptor comes from the share of years with a Storm Events record; NRI's source records more events, so the two differ.

Descriptor scale used in this packet (defined per unit)

Sources: 5, 6

UnitDescriptorDefinition
events per yearHighly likely1 or more per year
events per yearLikelyabout once in 1 to 10 years
events per yearPossibleabout once in 10 to 100 years
events per yearUnlikelyless than once in 100 years
annual probabilityLikely10% to under 100% chance in a given year
annual probabilityPossible1% to under 10% chance in a given year
annual probabilityUnlikelyunder 1% chance in a given year
event-days (share of years)Highly likelyevent-days recorded in 90% or more of years
event-days (share of years)Likelyevent-days recorded in 10% to under 90% of years
event-days (share of years)Possibleevent-days recorded in some years but under 10% of years
lightning strike-daysHighly likelycloud-to-ground strikes on 1 or more days per year

Intensity bands: historical frequency (Storm Events)

Source: 6

HazardBandYearsEventscounty-coded recordsYears in periodEvents per yearevents / years
Hail1.00-1.99 in1996 to 202542301.4
Hail2.00 in+1996 to 20251300.0333
Thunderstorm Wind (counted as NRI Strong Wind)50-64 kt1996 to 202573302.43
Thunderstorm Wind (counted as NRI Strong Wind)65 kt+1996 to 202511300.367
Thunderstorm Wind (counted as NRI Strong Wind)unmeasured or below 50 kt1996 to 20256300.2
TornadoEF0-11996 to 20253300.1
TornadoEF2-31996 to 20250300
TornadoEF4-51996 to 20250300
Tornadounrated (EFU)1996 to 20250300

The bands show how often events of each severity were recorded in this county, to profile how severe events have been (FEMA's probability item asks for the range of intensities).

Hail smaller than 1 inch is not counted: on 2010-01-05 the National Weather Service raised its severe-hail threshold from 3/4 inch to 1 inch, so smaller reports became less common after 2009 (NWS Service Change Notice 09-52). NRI hail frequency uses a 0.75 inch threshold.

Optional: future conditions. Not a required item in the 2025 FEMA Local Mitigation Planning Policy Guide; some states ask for it. The federal Climate Mapping for Resilience and Adaptation (CMRA) site gives county exposure to future climate conditions (https://resilience.climate.gov/).

Supports FEMA checklist item B1-f: hazards that vary across jurisdictions

Range of census tract risk within the county

Source: 5

HazardTractsrated of allNRI risk score, 0 to 100Tracts by rating
MinMedianMax
Avalanche5 of 249.611.514.6Very Low 5, Not Applicable 19
Cold Wave24 of 2433.489.398.0Very High 1, Relatively High 21, Relatively Moderate 1, Relatively Low 1
Drought18 of 2466.867.779.8Relatively Low 1, Very Low 17, No Rating 6
Earthquake24 of 2423.068.786.3Relatively Moderate 6, Relatively Low 14, Very Low 4
Hail24 of 2420.249.473.2Relatively Moderate 1, Relatively Low 22, Very Low 1
Heat Wave24 of 246.368.289.0Relatively High 1, Relatively Moderate 19, Relatively Low 3, Very Low 1
Hurricane0 of 24Not Applicable 24
Ice Storm24 of 241.77.927.7Very Low 24
Inland Flooding24 of 240.717.680.8Relatively High 1, Relatively Moderate 2, Relatively Low 10, Very Low 11
Landslide22 of 248.721.694.8Relatively Low 2, Very Low 20, No Rating 2
Lightning24 of 2416.583.396.9Very High 2, Relatively High 13, Relatively Moderate 8, Very Low 1
Strong Wind24 of 246.021.539.1Relatively Low 14, Very Low 10
Tornado24 of 242.315.430.4Relatively Low 1, Very Low 23
Volcanic Activity24 of 2442.879.383.2Very Low 24
Wildfire20 of 2467.495.499.6Very High 2, Relatively High 6, Relatively Moderate 7, Relatively Low 4, Very Low 1, No Rating 4
Winter Weather24 of 2453.097.099.7Very High 16, Relatively High 7, Relatively Moderate 1

Drought: Agriculture is all of NRI's expected annual loss for this hazard in the county, so the tract range mostly reflects where crop and livestock value is.

Rated tracts only: No Rating (score 0.0), Not Applicable and Insufficient Data tracts are counted but not used for the minimum, median and maximum.

The score ranks a tract against all U.S. tracts (100 = highest). The rating is FEMA's category for the tract's risk value, computed differently, so the two can disagree.

Frequency data for cold wave, drought, hail, heat wave, ice storm, lightning, strong wind and winter weather are county-wide or coarse (49 km grid or NWS zone), the same for every jurisdiction; the tract range mostly reflects where buildings and people are (crop and livestock value where a line above names agriculture).

Each jurisdiction (starting figures from federal data)

Sources: 1, 3, 4, 6

JurisdictionTypePlan statusRepetitive lossFMA RL and SRL (44 CFR 77.2); repeat-flood, any definitionPublic Assistance to this jurisdictionFEMA records matched by applicant name; federal share obligated, nominal dollarsEvent records naming this placeall years; since its plan
Bannock CountyCountyApproved, expires 2027-01-02FMA RL 0, SRL 0; any 0no Public Assistance recorded0 total; 0 since its plan
Chubbuck cityCityApproved, expires 2027-01-02FMA RL 0, SRL 0; any 0no Public Assistance recorded56 total; 18 since its plan
Inkom cityCityApproved, expires 2027-01-02FMA RL 0, SRL 0; any 0no Public Assistance recorded24 total; 4 since its plan
Lava Hot Springs cityCityApproved, expires 2027-01-02FMA RL 0, SRL 0; any 0no Public Assistance recorded10 total; 5 since its plan
McCammon cityCityApproved, expires 2027-01-02FMA RL 0, SRL 0; any 0no Public Assistance recorded0 total; 0 since its plan
Pocatello cityCityApproved, expires 2027-01-02FMA RL 0, SRL 0; any 1no Public Assistance recorded131 total; 26 since its plan

Repetitive-loss counts are for whole NFIP communities, which can extend beyond this county (see the note in B2-c).

County Public Assistance in B1-d also includes applicants filed under the county that are not jurisdictions in this plan (for example state agencies, special districts and nonprofits), so the jurisdiction rows add up to less.

Supports FEMA checklist items B2-a and B2-b: vulnerability and potential impacts

Local data needed

The table below gives county-level starting figures; the plan describes impacts for each jurisdiction and its own assets.

  • Critical facilities and lifelines per hazard
  • A problem statement per jurisdiction per hazard
  • Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a)
  • Future assets

County-level starter: exposure, expected annual loss and damage since the plan

Sources: 1, 2, 3, 5, 6, 7

HazardBuilding exposuremodeled dollarsAgriculture exposuremodeled dollarsPopulation exposedpeopleEAL buildingsmodeled dollars per yearEAL agriculturemodeled dollars per yearCost of expected deaths and injuriesFEMA's dollar value per year, not property damageEAL as % of exposurebuildings; agriculture where notedStorm Events damage since 2022-01-03county-coded records, property plus crops, nominal dollarsZone-level damage since planproperty plus crops, reported for the zonePublic Assistance since plannominal dollars; see noteNote
Avalanche$0n/aunder 1$0n/a$64building exposure is 0 in NRI
Cold Wave$15,614,308,960$48,678,40786,991$7,427$25,877$7,522,796under 0.0001%$0
Droughtn/a$19,356,955n/an/a$1,428n/a0.00738% (agriculture)NRI has no building exposure for this hazard; agriculture shown
Earthquake$28,363,632,660n/a87,018$2,002,753n/a$638,6270.00706%
Hail$15,614,308,960$48,678,40786,991$196,087$499$20,6400.00126%$0
Heat Wave$15,614,308,960$48,678,40786,991$131$2,898$1,718,463under 0.0001%$0
HurricaneNot Applicable in NRI for this county
Ice Storm$15,614,308,960n/a86,991$14,073n/a$5,935under 0.0001%
Inland Flooding$15,606,919,377$6,240,5391,334$8,410,101$13,059$4,606n/a (see note)$2,500NRI counts the full building value of any census block with some flood loss; this is not the value of buildings in the floodplain. Use local FIRM overlays for B2-a/B2-b.
Landslide$475,051,434n/a2,691$1,662n/a$1,2810.00035%
Lightning$15,614,308,960n/a86,991$75,390n/a$794,5080.000483%$11,000
Strong Wind$15,614,308,960$48,678,40786,991$52,632$320$70,2300.000337%$88,000$883,000Storm Events damage since the plan includes 8 zone-level High Wind records ($883,000): a NOAA non-thunderstorm wind type, outside NRI's Strong Wind definition.
Tornado$15,614,308,960$48,678,40786,991$116,758$169$59,7540.000748%
Volcanic Activity$15,614,308,960n/a86,991under $1n/a$99under 0.0001%
Wildfire$1,814,743,731$23,457,32916,028$8,005,044$1,007$576,8910.441%$254,000
Winter Weather$15,614,308,960$48,678,40786,991$3,842$19$993,276under 0.0001%$510,000

Totals since 2022-01-03 (Storm Events through 2026-06-30): 57 county-coded records, 57 with a damage value recorded (including $0), $101,500; 92 zone-level records, 92 with a damage value recorded (including $0), $1,647,000 reported for the zone; Public Assistance: no counted declaration since the plan.

FEMA does not split Public Assistance by hazard. A declaration mapped to several hazards is listed under each of them with its full amount, so the per-hazard column does not add up to the total; the unit total counts each declaration once.

NRI computes earthquake exposure on its own basis, so it exceeds the county building value in B2-a.

Supports FEMA checklist item B2-a: vulnerability (county context)

County context

Source: 5

MeasureValue
Population86,991
Building value (total, not at risk)$15,614,308,960
Agriculture value (total, not at risk)$48,678,407
NRI risk rating (all hazards)Relatively Low
Expected annual loss, buildings and agriculture, all hazards$18,931,177
Expected annual loss, population equivalence, all hazards (NRI values each statistical life at $13.7M; a modeled value of expected deaths and injuries, not property damage)$12,407,170
Social vulnerability ratingVery Low
Community resilience ratingRelatively Moderate
NRI versionDecember 2025

FEMA's all-hazard expected annual loss adds buildings, agriculture and population equivalence; this table gives the property part and the population-equivalence part as separate rows.

Social vulnerability: higher means people are more likely to be harmed and slower to recover. Community resilience: lower means the community is less able to recover. High social vulnerability and low resilience both raise the NRI risk rating.

Supports FEMA checklist item B2-c: repetitive loss properties

Repetitive loss in this county, both definitions

Sources: 1, 4

DefinitionPropertiesSevere repetitive lossProperties
Repetitive loss, FMA definition (44 CFR 77.2)0Severe repetitive loss, FMA definition (44 CFR 77.2)0
Repetitive loss, NFIP insurance definition1Severe repetitive loss, NFIP insurance definition0

The state NFIP coordinator's list, the source FEMA's Handbook names, often uses the NFIP insurance definition (second row).

Repeat-flood properties: county total and NFIP communities

Sources: 1, 4

ScopeRL, FMApropertiesSRL, FMApropertiesRL, NFIPpropertiesSRL, NFIPpropertiesAny categorypropertiesMitigatedpropertiesCurrently insuredproperties
County total0010100
of which: Pocatello city0010100

Repeat-flood properties by jurisdiction in the plan (NFIP community)

Sources: 1, 4

JurisdictionNFIP community IDRL, FMApropertiesSRL, FMApropertiesRL, NFIPpropertiesSRL, NFIPpropertiesAny categorypropertiesMitigatedpropertiesCurrently insuredproperties
Bannock County1600090000000
Chubbuck city1601620000000
Inkom city1600100000000
Lava Hot Springs city1600110000000
McCammon city1601760000000
Pocatello city1600120010100

Counts by occupancy group for each jurisdiction are in the Excel file, sheet "B2-c Jurisdictions".

Jurisdiction rows are whole NFIP communities and need not add up to the county total: a community that extends into another county is counted in full on each jurisdiction row, while the county table counts only its part in this county.

County repeat-flood properties by occupancy group

Sources: 1, 4

Occupancy groupRL, FMApropertiesSRL, FMApropertiesRL, NFIPpropertiesSRL, NFIPpropertiesAny categorypropertiesMitigatedpropertiesCurrently insuredproperties
single-family residential0010100
2 to 4 unit residential0000000
other residential0000000
non-residential0000000
not reported0000000

FEMA's occupancy groups have no institutional class; institutional properties are counted in non-residential or other residential in the table by occupancy group.

FMA RL and FMA SRL are the Flood Mitigation Assistance definitions (44 CFR 77.2), the ones the FEMA Local Mitigation Planning Policy Guide cites. NFIP repetitive loss (the FEMA insurance definition) is 2 or more claims over $1,000 in 10 years, and a property can leave that group once it is mitigated. Also shown: NFIP severe repetitive loss, any category, mitigated and currently insured. The Methods page gives the OpenFEMA field details.

Counts are aggregates of FEMA's public NFIP Multiple Loss Properties file (FEMA's data date 2026-08-02; file version 2026-08-04). No property is identified. County assignment is FEMA's geocode.

In this county 0 properties are FMA repetitive loss but not NFIP repetitive loss, and 1 property is NFIP repetitive loss but not FMA repetitive loss.

Exact counts; no count suppression.

Sources

Tables cite these sources by number. The full list, for the plan's bibliography (FEMA review item A4-a):

  1. FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-29T134039Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
  2. FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-29T162832Z, pulled 2026-09-30, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
  3. FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-29T150754Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
  4. FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
  5. FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-30, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
  6. NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-30, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
  7. NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-30, https://www.weather.gov/gis/ZoneCounty
  8. U.S. Census Bureau, Census 2024 Gazetteer, 2020 place by county, CT county-to-cousub crosswalk, version 2024-gazetteer, pulled 2026-09-30, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_counties_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_cousubs_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_place_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_unsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_elsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_scsd_national.zip, https://www2.census.gov/geo/docs/reference/codes2020/national_place_by_county2020.txt, https://www2.census.gov/geo/docs/reference/ct_change/ct_cou_to_cousub_crosswalk.xlsx (used to match place names and codes; no table prints its values)

What this packet is and what the plan adds

This packet is the federal data for the plan's risk assessment, organized by the items of FEMA's Local Mitigation Plan Review Tool, Element B. Each section heading names the item its tables support; the plan and FEMA's review decide whether the item is met.

The plan adds what only the community has: local data on assets, critical facilities, development and each jurisdiction's impacts; local hazard history, including state-declared emergencies; the mitigation strategy; and adoption.

How the federal data are built: National Risk Index values are FEMA's model, not counts of events. Storm Events is more complete from 1996; zone-level records are placed by forecast zone, not by location in the county. Public Assistance for a jurisdiction is matched by applicant name. The Methods page gives every rule and the known edge cases.

OpenFEMA disclaimer

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

Reuse, citation and corrections

Reuse and citation: Hazard Plain text and tables are licensed under Creative Commons Attribution 4.0 International (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/); credit Hazard Plain and the release. The underlying federal data are public domain; OpenFEMA data are also subject to the OpenFEMA terms and conditions.

Cite this: Hazard Plain (2026). Bannock County, ID: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 16005). Automated baseline. https://hazardplain.org/id/16005/ Built from FEMA OpenFEMA, the FEMA National Risk Index and NOAA NCEI Storm Events; source versions in the packet's Sources list.

Corrections: to report an error, name the packet, the table and what your records show. Contact: [email protected]

Hazard Plain release 2026-10. As of 2026-09-30; Storm Events data through 2026-06-30. Automated baseline.