Llano River near Mason, TX
River level and flood forecast · Mason County
Normal6.7 ftas of Mon 2 PM
The river is 11.3 ft below flood stage (18 ft).
Flow: 366 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sat, Oct 3, 1:44 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 28 ft |
| Moderate flood stage | 24 ft |
| Flood stage | 18 ft |
| Action stage | 11 ft |
| Record crest (September 8, 1980) | 37 ft |
What floods at each level
From the National Weather Service, highest first.
- 28 ftMajor lowland flooding will occur. Roads and low water crossings will be flooded and impassible.
- 24 ftModerate lowland flooding will occur. Secondary roads and low water crossings will be flooded and impassible.
- 18 ftMinor lowland flooding will occur. Secondary roads and low water crossings will become flooded.
Highest crests on record
- 37 ft — September 8, 1980
- 34.21 ft — October 16, 2018
- 32 ft — November 4, 2000
- 31.33 ft — June 13, 2008
- 29.91 ft — July 4, 2025
Recent crests: 26.97 ft (July 18, 2026) · 20.29 ft (July 14, 2025) · 29.91 ft (July 4, 2025) · 24.08 ft (July 24, 2024) · 34.21 ft (October 16, 2018)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MLRT2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.