Rivers in Texas
Blanco River at San Marcos
Below flood stage
6.31ftStage
Observed Sun, Sep 20, 11:45 AM CDT
- Flood stage
- 18.00 ft
- Record crest
- 43.10 ft2015
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 30.00 ft |
| Moderate flood | 24.00 ft |
| Minor flood | 18.00 ft |
| Action | 13.00 ft |
- 43.00 ftWater is several inches deep in the Walmart and CVS parking lots and other business in the region. Water surrounds the Balnco River Lodge apartments. Water into many homes and businesses along the river between I-35, SH 80 and River road. Water over teh Hwy 80 bridge at San Marcos
- 30.00 ftWater begins to enter many homes and businesses begin to have water entering the structures. More secondary and even primary raods become impassable for vehicles
- 24.00 ftLowest homes are threatened. Water beings to cut off secondary roads near the river
- 18.00 ftRoadways and low bridges along the river are flooded. Vehicles cannot pass. Livestock can be stranded.
- 13.00 ftOverbank conditions may cut off livestock and low bridges near the river
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 21% |
| Moderate flooding | 11% |
| Major flooding | 8% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.
Crest history
8 crests on NOAA’s list since 2015.
| # | Date | Stage |
|---|---|---|
| 1 | May 24, 2015 | 43.10 ft |
| 2 | October 30, 2015 | 42.56 ft |
| 3 | October 14, 2021 | 24.71 ft |
| 4 | May 9, 2019 | 24.14 ft |
| 5 | May 4, 2019 | 20.53 ft |
| 6 | September 26, 2016 | 15.23 ft |
| 7 | April 11, 2017 | 13.49 ft |
| 8 | August 27, 2017 | 10.93 ft |
Most recent crests
- October 14, 2021: 24.71 ft
- May 9, 2019: 24.14 ft
- May 4, 2019: 20.53 ft
- August 27, 2017: 10.93 ft
- April 11, 2017: 13.49 ft
- September 26, 2016: 15.23 ft
- October 30, 2015: 42.56 ft
- May 24, 2015: 43.10 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the West Gulf River Forecast Center. Forecasts are issued routinely year-round. 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.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.