Blanco River at San Marcos

Last updated: Jul 20, 2025, 4:18 AM UTC
No watches, warnings or advisories are in effect for this area.

Flood Impacts 🅘

  • 43 - Water 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 - Water 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 - Lowest homes are threatened. Water beings to cut off secondary roads near the river

Gauge Info

Coordinates 29.8794, -97.9106
RFC WGRFC
State TX
WFO EWX
County Hays
Data Provider(s)
US Geological Survey USGS--Water Resources of the United States
USGS 08171350

Gauge Location

Recent Crests

1. 24.71 ft on 10-14-2021
2. 24.14 ft on 05-09-2019
3. 20.53 ft on 05-04-2019
4. 10.93 ft on 08-27-2017 (P)
5. 13.49 ft on 04-11-2017 (P)

Historic Crests

1. 43.10 ft on 05-24-2015 (P)
2. 42.56 ft on 10-30-2015 (P)
3. 24.71 ft on 10-14-2021
4. 24.14 ft on 05-09-2019
5. 20.53 ft on 05-04-2019

Gauge Photos

No Images Found

Probability Information

No Images Available

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

WFO Information

Weather Forecast Office
Austin/San Antonio
2090 Airport Road
New Braunfels, TX 78130
Official Homepage