Enter any address in Grand County, Utah to see its FEMA flood zone
Flash flooding from summer thunderstorms is the dominant flood character in Grand County. Between 2000 and 2023, NOAA Storm Events data recorded 79 flash flood events and 15 general flood events. Recent examples include flash flooding in August 2024, driven by monsoonal moisture and heavy rainfall rates exceeding 2 inches per hour, and severe weather in June 2024, which also produced heavy rain and flash flooding.
National Flood Insurance Program (NFIP) claims data shows that while Zone A areas have had more claims (5), Zone X areas have experienced higher average payouts ($23,615) and greater average water depths (1.0 ft) compared to Zone A ($15,124 payout, 0.6 ft water depth). Homeowners in areas designated as Zone A or Zone X should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
26 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Grand County, Utah has recorded 94 flood-related events since 1996 according to NOAA's Storm Events Database, including 79 flash floods and 15 river or area floods. The county has received 4 federal disaster declarations, 1 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1977–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Hurricane Katrina Evacuation | Coastal Storm | Aug 29, 2005 |
| Drought | Drought | Jan 20, 1977 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Sep 12, 2025 | 30.00K |
| Flash Flood | Sep 12, 2025 | 3.00K |
| Flash Flood | Jun 27, 2024 | 0.00K |
| Flash Flood | Aug 23, 2024 | 0.00K |
| Flash Flood | Jun 21, 2024 | 0.00K (2 deaths) |
| Flash Flood | Aug 24, 2023 | 0.00K |
| Flood | May 18, 2023 | 2.50K |
| Flood | Aug 17, 2023 | 0.00K |
| Flood | May 5, 2023 | 1.00K |
| Flood | May 5, 2023 | 0.50K |
Flash Flood — Sep 12, 2025
The period between the 11th and 13th of September had a relatively unique meteorological setup for western Colorado and eastern Utah. A potent closed low was located over Southern California, and a ridge of high pressure was located to our southeast, directing a rich plume of monsoonal moisture northward through the Four Corners. Mixing ratios in this plume of moisture were more than high enoug...
Flash Flood — Jun 27, 2024
Deep subtropical moisture increased across eastern Utah and western Colorado and combined with forcing from a strong low pressure trough digging across the Intermountain West to result in widespread severe thunderstorms. These storms produced severe wind gusts, large hail and heavy rain that resulted in flash flooding and debris flows.
Flash Flood — Aug 23, 2024
With deep monsoonal moisture in place, as well as around 1000 J/kg of instability and some bulk shear aloft, widespread strong to severe thunderstorms formed across the Four Corners region. This resulted in multiple severe threats in eastern Utah which included large hail and flash flooding due to heavy rainfall rates in excess of 2 inches per hour.
Flash Flood — Jun 21, 2024
Very deep tropical moisture associated with the remnants of Tropical Storm Alberto combined with monsoonal moisture was forced through eastern Utah and western Colorado due to a large high pressure ridge over the Central U.S. and a deep low pressure trough over the Great Basin. This deep moisture combined with strong instability and shear to produce widespread severe weather across eastern Utah...
Flash Flood — Aug 24, 2023
Remnants from Tropical Storm Harold lifted across the Desert Southwest. This, combined with already abundant subtropical moisture, resulted in widespread showers and thunderstorms across eastern Utah. Storms were slow moving and produced heavy rain. As a result of the heavy rain, some flash flooding occurred in portions of Grand 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 Grand County, Utah:
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 Grand County, Utah 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.