San Antonio River at Elmendorf, TX
River level and flood forecast · Bexar County
Normal9.5 ftas of Mon 2:30 PM
The river is 25.5 ft below flood stage (35 ft).
Flow: 116 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 | 48 ft |
| Moderate flood stage | 39 ft |
| Flood stage | 35 ft |
| Action stage | 33 ft |
| Record crest (October 18, 1998) | 64.2 ft |
What floods at each level
From the National Weather Service, highest first.
- 60 ftDownstream in Wilson county people cut off by numerous flooded Farm to Market roads. Numerous homes are flooded in Wilson county as well.
- 52 ftWidespread major flooding damages crops and pastureland. Roads and bridges are flooded and dangerous. Oil field pump jacks and irrigation pumps are flooded and damaged. Many livestock can be cut off and drowned.
- 48 ftMajor flooding near Elmendorf to above Goliad State Park isolates livestock, damages crops and roads, floods oil field tank batteries, pump jacks, irrigation pumps, and any equipment in the flood plain. Flooding is widespread.
- 45 ftModerate lowland flooding inundates crop and pastureland below San Antonio to below Floresville. Roads and bridges in the flood plain are flooded. Pump jacks and oil field tank batteries flood.
- 43 ftModerate lowland flooding inundates and damages crop and pastureland below San Antonio to below Floresville. Numerous roads and bridges are flooded. Oil well pump jacks and irrigation pumps are flooded and damaged.
- 39 ftModerate lowland flooding damages crops and floods pastureland below San Antonio to below Floresville. Secondary roads and low bridges, irrigation pumps, oil field pump jacks and tank batteries flood. Livestock are cut off in low areas.
- 35 ftMinor lowland flooding inundates crop and pastureland below San Antonio to below Floresville.
- 33 ftOverbank conditions may cut off livestock in low areas.
Highest crests on record
- 64.2 ft — October 18, 1998
- 63.16 ft — July 6, 2002
- 61 ft — September 27, 1946
- 53.06 ft — June 5, 1986
- 53 ft — June 28, 1913
Recent crests: 42.63 ft (June 13, 2025) · 38.64 ft (October 15, 2021) · 39.91 ft (July 7, 2021) · 44.82 ft (June 3, 2016) · 44.99 ft (May 24, 2015)
Up and down the river, and nearby
- UpstreamSan Antonio River at Loop 410, TX
- DownstreamSan Antonio River near Floresville, TX
- Medina River at San Antonio US 281S, TX
- Salado Creek at Loop 13, TX
- Medina River near Somerset, TX
- San Antonio River at Mitchell Street, TX
- Leon Creek at I-35S near San Antonio, TX
- Atascosa River at FM 476 near Pleasanton, TX
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ELMT2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.