Enter any address in Jefferson County, Idaho to see its FEMA flood zone
3 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Jefferson County, Idaho has recorded 11 flood-related events since 1996 according to NOAA's Storm Events Database, including 1 flash floods and 10 river or area floods. The county has received 6 federal disaster declarations, 2 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1976–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Winter Storms And Flooding | Flood | Feb 5, 2017 |
| Hurricane Katrina | Hurricane | Aug 29, 2005 |
| Severe Storms, Snowmelt, Land/mud Slides, Flooding | Severe Storm | Mar 14, 1997 |
| Dam Collapse, Flooding | Flood | Jun 6, 1976 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Apr 9, 2023 | 126.50K |
| Flood | Mar 1, 2019 | 0.00K |
| Flood | May 12, 2018 | 100.00K |
| Flood | Feb 5, 2017 | 2.43M |
| Flood | May 1, 2017 | 38.00K |
| Flood | Mar 1, 2017 | 435.00K |
| Flood | Jun 1, 2017 | 13.00K |
| Flash Flood | Aug 5, 2014 | 0.00K |
| Flood | Jun 6, 2011 | 0.00K |
| Flood | May 1, 2011 | 2.00K |
Flood — Apr 9, 2023
The beginning of snowmelt season brought some initial sheet flooding to Jefferson County with road and bridge damage and surrounding some homes Minimal damage occurred to the homes with about 126 thousand dollars of road and bridge damage.
Flood — Mar 1, 2019
Some flooding occurred in Jefferson County closing a few roads, but cooling temperatures eased the issue. Only minor damage occurred.
Flood — May 12, 2018
Seasonal snow melt flooding along with heavy rain caused significant damage to the levee near Lorenzo as it was eroding 500 feet per day. The Snake River and Henry's Fork of the Snake flowed at action stage for several weeks causing the event. Jefferson County declared disaster as it was costing 9,000 dollars per day for seven days. The County used all of their 40,000 dollars for the rep...
Flood — Feb 5, 2017
A trend toward above normal temperatures in February after extreme snowfall amounts in both December and January led to extensive flooding issues during the entirety of the month. The brunt of the flooding occurred in Cassia, Minidoka, Jefferson, Lincoln and Bingham Counties but all counties did receive at least minor flooding. The floding began February 4th and continued to affect low lying...
Flood — May 1, 2017
Winter snow melt continued from record winter snowfall and flooding continued throughout much of May in much of southeast Idaho especially in the central mountains and along the Big Wood River.
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Jefferson County, Idaho:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Jefferson County, Idaho that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.