Enter any address in San Juan County, Utah to see its FEMA flood zone
Flash flooding from summer thunderstorms dominates San Juan County's flood risk. Over the past 30 years, NOAA Storm Events data shows 59 flash flood events and 10 general flood events. Recent examples include flash flooding on August 26, 2025, caused by monsoonal moisture and atmospheric lift, and on June 4, 2025, due to deep moisture and unstable conditions.
These events can be severe, as seen with the remnants of Tropical Storm Alberto contributing to heavy rain and flash flooding on June 21, 2024. Another instance on August 10, 2024, involved training storms and monsoonal moisture leading to significant flash flooding. Homeowners in flood zones, particularly those near washes or canyons prone to rapid water runoff, should pay close attention to flood risks.
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.
San Juan County, Utah has recorded 69 flood-related events since 1996 according to NOAA's Storm Events Database, including 59 flash floods and 10 river or area floods. The county has received 6 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 (1977–2025)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Deer Creek Fire | Fire | Jul 10, 2025 |
| Pack Creek Fire | Fire | Jun 10, 2021 |
| 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 | Aug 26, 2025 | 0.00K |
| Flash Flood | Jun 4, 2025 | 50.00K |
| Flash Flood | Jun 21, 2024 | 0.00K |
| Flash Flood | Aug 10, 2024 | 0.00K |
| Flash Flood | Sep 14, 2023 | 12.00K |
| Flash Flood | Aug 26, 2022 | 0.50K |
| Flash Flood | Aug 20, 2022 | 0.25K |
| Flash Flood | Aug 14, 2022 | 5.00K |
| Flash Flood | Aug 11, 2022 | 0.50K |
| Flood | Jul 25, 2021 | 2.00K |
Flash Flood — Aug 26, 2025
Unusually rich monsoonal moisture was in place on the morning of August 26th, with precipitable water close to 1.00 inch across eastern Utah and western Colorado. A jet streak moving in aloft brought not only additional moisture, but some extra lift as well. In addition, daytime heating on the complex terrain in this region help to spur on afternoon convection. As a result, widespread shower an...
Flash Flood — Jun 4, 2025
Anomalously deep moisture was present across southeast Utah and southwest Colorado on the afternoon of June 4th. Enough sunshine had gotten through during the morning hours to create afternoon instability of 500-1000 J/Kg, more than enough to produce some strong storms. In addition, atmospheric profiles favored heavy rain development and slow moving, training thunderstorms. All these factors co...
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 10, 2024
High pressure over Texas and low pressure over the Baja Coast kept a deep southerly flow of monsoonal moisture across the Four Corners region. Training storms led to significant flash flooding across southeast Utah.
Flash Flood — Sep 14, 2023
A shortwave trough paired with increased moisture and daytime heating resulted in scattered showers and thunderstorms across eastern Utah. Storms were largely slow moving and some of them produced heavy rain. As a result of the heavy rain, some flash flooding occurred in portions of San Juan County.
Source: NOAA National Weather Service Storm Events Database.
FEMA assigns flood zone designations to areas in San Juan 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 San Juan 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.