Enter any address in Fremont County, Wyoming to see its FEMA flood zone
Flash flooding from intense thunderstorms is the dominant flood character in Fremont County, Wyoming. In July 2025, heavy rainfall overwhelmed highway culverts near Shoshoni, with water observed 4 feet deep across Highway 20/26. Later that August, monsoonal moisture brought high rainfall rates to Jeffrey City, leading to ponding water throughout the town. While minor flooding along the Wind River has also occurred, primarily due to rain and snowmelt, the more severe flash flood events highlight the potential for rapid inundation.
Residents in Zone A, which has seen NFIP claims with an average water depth of 1.9 feet and payouts averaging $6,173, should pay particular attention. Properties in Zone X_UNSHADED, while experiencing fewer claims, have also seen water depths averaging 2.0 feet. Homeowners in these identified zones, especially those located in low-lying areas or near drainage pathways, are most likely to be impacted by flood events.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
29 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Fremont County, Wyoming has recorded 67 flood-related events since 1996 according to NOAA's Storm Events Database, including 22 flash floods and 45 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 (2010–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Flooding | Flood | Jun 7, 2017 |
| Lava Mountain Fire | Fire | Jul 25, 2016 |
| Severe Storms, Flooding, And Landslides | Severe Storm | May 18, 2011 |
| Flooding | Flood | Jun 4, 2010 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jul 30, 2025 | 20.00K |
| Flash Flood | Aug 27, 2025 | 0.00K |
| Flood | Jun 22, 2023 | 0.00K |
| Flood | Jun 20, 2023 | 0.00K |
| Flood | Jun 11, 2022 | 0.00K |
| Flood | Jun 30, 2020 | 0.00K |
| Flood | Jun 29, 2020 | 0.00K |
| Flood | Jun 1, 2020 | 0.00K |
| Flash Flood | Jul 23, 2019 | 75.00K |
| Flash Flood | Jul 22, 2019 | 0.00K |
Flash Flood — Jul 30, 2025
During the late evening of July 30, 2025, numerous thunderstorms developed over the Moneta area to the east of Shoshoni, WY and to the north of Highway 20/26. Radar derived rainfall estimates between 7 PM and 11 PM MDT were 2 to 3 inches, with an additional 1 inch of rainfall estimated the day before (July 29). This caused the highway culverts for Frenchie Draw to be overwhelmed. WYDOT employee...
Flash Flood — Aug 27, 2025
A significant push of monsoonal moisture brought rainfall to much of Wyoming on 8/27/25. Thunderstorms with high rainfall rates near Jeffrey City led to flash flooding for portions of the town. The public reported ponding water in low spots throughout Jeffrey City. Radar estimates showed 1.0 to 1.5 inches of rain falling on the town of Jeffrey City within a 1 hour period, with up to 2 inches fa...
Flood — Jun 22, 2023
A combination of heavy rain and mountain snow melt brought minor flooding along the Wind River. The flooding remained in the low lying areas near the river and caused no property damage or road closure.
Flood — Jun 20, 2023
A combination of heavy rain and mountain snow melt brought minor flooding along the Wind River. The flooding remained in the low lying areas near the river and caused no property damage or road closure.
Flood — Jun 11, 2022
A combination of snowmelt and rain in the mountains brought minor flooding along the Wind River from Crowheart, WY through Riverton, WY. The flooding remained confined to low-lying areas along the river and no damage was reported.
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 Fremont County, Wyoming:
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 Fremont County, Wyoming 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.