Llano River near Mason
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Downstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/15/2025 2:15 AM CDTRecord: 46 ftCATEGORY STAGE 
Major Flooding 28 ft Moderate Flooding 24 ft Minor Flooding 18 ft Action 11 ft Reliability of the Forecast:
NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.
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.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 28 - Major lowland flooding will occur. Roads and low water crossings will be flooded and impassible.
- 24 - Moderate lowland flooding will occur. Secondary roads and low water crossings will be flooded and impassible.
- 18 - Minor lowland flooding will occur. Secondary roads and low water crossings will become flooded.
Gauge Info
| Coordinates | 30.6606, -99.1089 |
| RFC | WGRFC |
| State | TX |
| WFO | SJT |
| County | Mason |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 08150700 |
Gauge Location
Recent Crests
| 1. | 24.08 ft | on 07-24-2024 |
| 2. | 34.21 ft | on 10-16-2018 |
| 3. | 14.53 ft | on 10-09-2018 |
| 4. | 22.68 ft | on 10-08-2018 |
| 5. | 0.61 ft | on 06-13-2008 |
Recent Crests
| 1. | 24.08 ft | on 07-24-2024 | |
| 2. | 34.21 ft | on 10-16-2018 | |
| 3. | 14.53 ft | on 10-09-2018 | |
| 4. | 22.68 ft | on 10-08-2018 | |
| 5. | 0.61 ft | on 06-13-2008 | |
| 6. | 31.33 ft | on 06-13-2008 | |
| 7. | 21.59 ft | on 11-17-2004 | |
| 8. | 17.74 ft | on 11-15-2001 | |
| 9. | 32.00 ft | on 11-04-2000 | |
| 10. | 16.38 ft | on 08-24-1998 | |
| 11. | 10.13 ft | on 09-17-1991 | |
| 12. | 14.78 ft | on 09-18-1990 | |
| 13. | 17.49 ft | on 05-03-1990 | |
| 14. | 18.40 ft | on 07-12-1988 | |
| 15. | 25.22 ft | on 12-31-1984 | |
| 16. | 25.06 ft | on 10-13-1981 | |
| 17. | 37.00 ft | on 09-08-1980 | |
| 18. | 21.35 ft | on 08-03-1978 | |
| 19. | 16.64 ft | on 04-16-1977 | |
| 20. | 26.30 ft | on 10-13-1973 | |
| 21. | 18.53 ft | on 10-05-1969 | |
| 22. | 46.00 ft | on 06-14-1935 | 1 |
Historic Crests
| 1. | 46.00 ft | on 06-14-1935 | 1 |
| 2. | 37.00 ft | on 09-08-1980 | |
| 3. | 34.21 ft | on 10-16-2018 | |
| 4. | 32.00 ft | on 11-04-2000 | |
| 5. | 31.33 ft | on 06-13-2008 |
Historic Crests
| 1. | 46.00 ft | on 06-14-1935 | 1 |
| 2. | 37.00 ft | on 09-08-1980 | |
| 3. | 34.21 ft | on 10-16-2018 | |
| 4. | 32.00 ft | on 11-04-2000 | |
| 5. | 31.33 ft | on 06-13-2008 | |
| 6. | 26.30 ft | on 10-13-1973 | |
| 7. | 25.22 ft | on 12-31-1984 | |
| 8. | 25.06 ft | on 10-13-1981 | |
| 9. | 24.08 ft | on 07-24-2024 | |
| 10. | 22.68 ft | on 10-08-2018 | |
| 11. | 21.59 ft | on 11-17-2004 | |
| 12. | 21.35 ft | on 08-03-1978 | |
| 13. | 18.53 ft | on 10-05-1969 | |
| 14. | 18.40 ft | on 07-12-1988 | |
| 15. | 17.74 ft | on 11-15-2001 | |
| 16. | 17.49 ft | on 05-03-1990 | |
| 17. | 16.64 ft | on 04-16-1977 | |
| 18. | 16.38 ft | on 08-24-1998 | |
| 19. | 14.78 ft | on 09-18-1990 | |
| 20. | 14.53 ft | on 10-09-2018 | |
| 21. | 10.13 ft | on 09-17-1991 | |
| 22. | 0.61 ft | on 06-13-2008 |
Gauge Photos
No Images Found
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.
Resources
Hydrologic Resource Links
Additional Resource Links
- NWS Precipitation and River Forecasting
- Area Hydrographs
- West Gulf River Forecast Center
- USGS Real Time Data for Texas
- Lower Colorado River Authority
- Brazos River Authority
- Colorado River Municipal Water District
- Texas - Reservoir Status (TWDB)
- US Army Corps of Engineers, Ft. Worth, TX
- US Bureau of Reclamation
- Upper Colorado River Authority