Llano River near Mason
Texas — Water Level & Flood Stage
Located in Mason County, Texas on the Llano River. Live water level data from USGS gauge 08150700, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
28 ft
Moderate Flood
24 ft
Minor Flood
18 ft
Action Stage
11 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
28 ft
Major lowland flooding will occur. Roads and low water crossings will be flooded and impassible.
24 ft
Moderate lowland flooding will occur. Secondary roads and low water crossings will be flooded and impassible.
18 ft
Minor lowland flooding will occur. Secondary roads and low water crossings will become flooded.
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 |
|---|---|---|
| Jun 13, 1935 | 46 ft | 380,000 cfs |
| Jun 13, 1935 | 46 ft | 380,000 cfs |
| Sep 8, 1980 | 37 ft | 260,000 cfs |
| Sep 8, 1980 | 37 ft | 260,000 cfs |
| Oct 15, 2018 | 34.21 ft | 193,000 cfs |
About This Gauge
Get Flood Alerts for Llano 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 Llano River near Mason?
The Llano River near Mason gauge is maintained by USGS (site 08150700) 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 Llano River near Mason?
The NWS-defined flood stage for Llano River near Mason is 18 feet. Action stage begins at 11 feet. Moderate flooding starts at 24 feet, and major flooding at 28 feet.
How do I get alerts when Llano River rises?
Download StormCast free on Google Play, go to River Gauges, and add Llano River near Mason to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Llano River near Mason gauge located?
The gauge is located in Mason County, Texas at coordinates 30.6606°N, 99.1089°W. USGS site number: 08150700. Data is provided by the U.S. Geological Survey and the National Weather Service.
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On This River
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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.