Enter any address in Washington County, Idaho to see its FEMA flood zone
River overflow along the Weiser River and other waterways characterizes flood risk in Washington County, Idaho. Over the past 30 years, NOAA Storm Events data recorded 17 flood events and 4 flash flood events. Recent examples include flooding along the Snake River in southern Washington County in April 2017, and minor flooding on the Weiser River near Weiser and Cambridge in March 2014 following heavy rains.
National Flood Insurance Program (NFIP) claims data indicates that properties in Zone A have experienced the most claims, with an average payout of $68,182 and an average water depth of 8.2 feet. Properties in Zone X also show significant claim payouts, averaging $33,274, though with a notably higher average water depth of 18.0 feet. Residents in areas near rivers and streams, as well as those in identified Zone A or Zone X flood zones, should pay particular attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
3 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Washington County, Idaho has recorded 21 flood-related events since 1996 according to NOAA's Storm Events Database, including 4 flash floods and 17 river or area floods. The county has received 9 federal disaster declarations, 3 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1964–2020)
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 |
| Severe Storms And Flooding | Severe Storm | Jun 2, 2010 |
| Hurricane Katrina | Hurricane | Aug 29, 2005 |
| Severe Storms, Flooding, Mud And Landslides | Severe Storm | Nov 16, 1996 |
| Drought | Drought | May 5, 1977 |
| Severe Storms, Snowmelt & Flooding | Flood | Jan 25, 1974 |
| Heavy Rains & Flooding | Flood | Dec 31, 1964 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Apr 8, 2019 | 0.00K |
| Flood | Mar 18, 2017 | 0.00K |
| Flood | Feb 10, 2017 | 1.00M |
| Flood | Mar 8, 2017 | 2.00K |
| Flood | Apr 1, 2017 | 0.00K |
| Flood | Mar 10, 2014 | 0.00K |
| Flood | Mar 15, 2011 | 0.00K |
| Flash Flood | Jun 4, 2011 | 0.00K |
| Flood | Jun 4, 2010 | 1.00M |
| Flash Flood | Jun 4, 2010 | 140.00K |
Flood — Apr 8, 2019
An Atmospheric River brought a persistent stream of moisture off the Pacific Ocean to West Central Idaho April 6-10. Rainfall totals of 2 to 5 inches were measured at many weather stations while snow melt added 1 to 3 inches of melt-water to the runoff. Main stem river flooding, flash flooding, and small stream flooding occurred during the event with record or near record crests observed on a ...
Flood — Mar 18, 2017
Rainfall and snow melt combined to increase the flow on the Snake River to minor flood stage.
Flood — Feb 10, 2017
An ice jam on the Weiser River just south of Weiser caused flooding on U.S. Highway 95.
Flood — Mar 8, 2017
Rainfall and snow melt combined to increase the flow on the Weiser River to minor flood stage.
Flood — Apr 1, 2017
Flooding continued from the previous month of March along the Snake River in southern Washington County.
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 Washington 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 Washington 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.