San Antonio River at Loop 410, TX
River level and flood forecast · Bexar County
Normal3.7 ftas of Mon 3:15 PM
The river is 8.3 ft below flood stage (12 ft).
Flow: 20 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 26 ft |
| Moderate flood stage | 20 ft |
| Flood stage | 12 ft |
| Action stage | 12 ft |
| Record crest (May 25, 2013) | 34.21 ft |
What floods at each level
From the National Weather Service, highest first.
- 30 ftDrainage from above loop 410 and Brooks City Base cuts streets and areas below Loop 410 in the San Antonio River flood plain off. Several homes have a few feet of water in them.
- 27 ftThree residences below Loop 410 on the left bank flood. Roads into the area are flooded and dangerous.
- 26 ftMajor flooding reaches slabs of residences on the left bank below Southeast Loop 410. Roads and streets near the San Antonio River are severely flooded and very dangerous.
- 23 ftModerate lowland flooding of lowest roads and bridges in the flood plain make auto traffic very dangerous. Lowest homes below Loop 410 in the left flood plain are threatened.
- 20 ftModerate lowland flooding of roads and streets below Brooks City Base and in the flood plain near Loop 410 makes auto travel in the flood plain very dangerous.
- 12 ftMinor lowland flooding extends into low areas of the flood plain with no significant impact.
Highest crests on record
- 34.21 ft — May 25, 2013
- 32.57 ft — October 17, 1998
- 32.2 ft — July 15, 1990
- 29.36 ft — May 27, 1992
- 27.6 ft — May 24, 2015
Recent crests: 13.46 ft (October 1, 2026) · 25.1 ft (June 12, 2025) · 15.68 ft (October 14, 2021) · 12.61 ft (October 9, 2018) · 27.43 ft (June 2, 2016)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SNPT2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.