Enter any address in Natrona County, Wyoming to see its FEMA flood zone
Flash flooding from summer thunderstorms is the dominant flood hazard in Natrona County. Between 2003 and 2023, NOAA Storm Events data recorded 29 flash flood events and 3 general flood events. Recent examples include heavy rain and hail causing localized flooding in northern Natrona County in June 2023, and a mudslide closing Casper Mountain Road in July 2021 following drenching thunderstorms.
NFIP claims data shows that properties in Zone A have the highest number of claims, with an average payout of $4,471. However, properties in Zone X, though fewer in number, have experienced significantly higher average payouts of $15,099, with an average water depth of 17 feet. Homeowners in Zone A, as well as those in Zone X, should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
16 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Natrona County, Wyoming has recorded 32 flood-related events since 1996 according to NOAA's Storm Events Database, including 29 flash floods and 3 river or area floods. The county has received 8 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 (1978–2023)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Flooding | Flood | Jun 15, 2023 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Station Fire | Fire | Oct 11, 2015 |
| Sheep Herder Hill Fire Complex | Fire | Sep 9, 2012 |
| Jackson Canyon Fire | Fire | Aug 14, 2006 |
| Wy - Dead Horse Fire | Fire | Jul 30, 2000 |
| Severe Storms, Flooding & Mudslides | Flood | May 29, 1978 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jun 29, 2023 | 0.00K |
| Flash Flood | Jun 15, 2023 | 2866.00K |
| Flash Flood | Jul 30, 2021 | 0.00K |
| Flash Flood | Jun 23, 2018 | 0.00K |
| Flash Flood | Jun 5, 2017 | 0.00K |
| Flash Flood | May 24, 2015 | 0.00K |
| Flash Flood | May 24, 2015 | 100.00K |
| Flash Flood | Jun 5, 2015 | 0.00K |
| Flash Flood | Oct 2, 2015 | 40.00K |
| Flash Flood | Aug 5, 2014 | 200.00K |
Flash Flood — Jun 29, 2023
Deep moisture and a passing shortwave combined to produce to slow moving strong to severe thunderstorms across Natrona County. The most notable storm occurred in northern Natrona County to the south of Midwest. A thunderstorm dropped large amounts of hail up to quarter size along Highway 259, leaving up to a foot of hail on the road that made travel very difficult for several hours. The combina...
Flash Flood — Jun 15, 2023
On June 15th, roughly between 300 PM and 415 PM MDT, slow moving thunderstorms fueled by a wet air mass led to heavy rain over parts of Natrona County, including the city of Casper, WY and surrounding suburbs. Rainfall rates of 1 to 2 inches per hour were common for many locations. These high rainfall rates combined with other factors, such as wet antecedent conditions, hilly topography, and ur...
Flash Flood — Jul 30, 2021
Drenching thunderstorms brought very heavy rain to Casper and Casper Mountain. On Casper Mountain Road, a mudslide closed the road for several hours from the evening of July 30th through the morning of July 31st.
Flash Flood — Jun 23, 2018
Three slowly moving thunderstorms merged over Midwest and brought large amounts of hail and street flooding. A rain gauge measured over 2.5 inches of precipitation with rain and melting hail. The hail flowed into a wash and drifted up to four feet in some areas. Flooding was also noted in Salt Creek Oil Field as well as in portions of Midwest.
Flash Flood — Jun 5, 2017
A cold front swept across Wyoming on the afternoon and evening of June 5th. With some additional upper level support from a vorticity maximum, thunderstorms developed across central Wyoming. A couple of these storms become severe. Quarter size hail was reported near Evansville. In addition, very heavy rain fell with some of these storms and caused localized flash flooding along Webb Creek Road ...
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 Natrona 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 Natrona 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.