Major Flood
17 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
7 ft
Minor Flood
6 ft
Action Stage
6 ft
What Floods at Each Level
17 ft
Major flooding reaches lowest homes and businesses downstream in Tilden. Hundreds of livestock are trapped and potentially drowned in low areas of the flood plain near Derby to Choke Canyon Reservoir. Major flooding of crop and pasture land near the river inundates oil well pump jacks and irrigation pumps.
14 ft
Significant crop and pastureland flooding below Uvalde to Choke Canyon Reservoir floods oil well pump jacks, irrigation pumps and any equipment in the flood plain. Numerous secondary roads and low bridges are flooded. Livestock are cut off and potentially drowned in low areas of the flood plain.
10 ft
Lowland flooding below Concan to Choke Canyon Reservoir floods oil well pump jacks, irrigation pumps and any equipment in the lower flood plain near and above Derby.
7 ft
Moderate lowland flooding closes Farm to Market 1581 near Derby.
6 ft
Minor lowland flooding reaches the Farm to Market 1581 bridge floor.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jul 3, 1932 | 29.45 ft | 230,000 cfs |
| Jun 1, 1935 | 23.7 ft | 68,300 cfs |
| Jul 21, 2007 | 22.02 ft | — |
About This Gauge
Get Flood Alerts for Frio River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Frio River near Derby?
The Frio River near Derby gauge is maintained by USGS (site 08205500) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Frio River near Derby?
The NWS-defined flood stage for Frio River near Derby is 6 feet. Action stage begins at 6 feet. Moderate flooding starts at 7 feet, and major flooding at 17 feet.
How do I get alerts when Frio River rises?
Download StormCast free on Google Play, go to River Gauges, and add Frio River near Derby to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Frio River near Derby gauge located?
The gauge is located in Frio County, Texas at coordinates 28.7364°N, 99.1444°W. USGS site number: 08205500. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.