Rio Grande at Johnson Ranch
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
- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
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Observed (OBS) 04/05/2025 2:15 AM CDTRecord: 28.4 ftCATEGORY STAGE 
Major Flooding 19 ft Moderate Flooding 17 ft Minor Flooding 15 ft Action 12 ft Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions
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 12 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
- 28.4 - the river reaches record stage (1978). Major flooding begins upstream in Cottonwood Campground at Castolon. Most park roads near the river flood.
- 19 - the river reaches major flood stage. Flooding begins to occur upstream in Cottonwood Campground at Castolon, as stages at each location are practically synonymous. Moderate lowland flooding begins at the gage site, but no damage occurs. The gage is inaccessible, as River Road is impassable at several locations.
- 15 - flood stage is reached. Moderate lowland flooding begins. Roads that lead to Cottonwood Campground and River Road may flood. Stages are practically synonymous with the gage at Cottonwood Campground at Castolon (CSTT2), and therefore represent the reach from Santa Elena Canyon through Cottonwood Campground, where damage may occur. Cattle also graze in the lowlands, and may be threatened.
Gauge Info
| Coordinates | 29.0350, -103.391 |
| RFC | WGRFC |
| State | TX |
| WFO | MAF |
| County | Brewster |
| Data Provider(s) | |
| Intl Boundary & Water Commission | IBWC-International Boundary and Water Commission |
Gauge Location
Recent Crests
| 1. | 18.52 ft | on 09-03-2024 |
| 2. | 15.74 ft | on 07-23-2024 |
| 3. | 15.03 ft | on 09-19-2022 |
| 4. | 16.17 ft | on 09-16-2022 |
| 5. | 15.74 ft | on 09-03-2022 |
Recent Crests
| 1. | 18.52 ft | on 09-03-2024 |
| 2. | 15.74 ft | on 07-23-2024 |
| 3. | 15.03 ft | on 09-19-2022 |
| 4. | 16.17 ft | on 09-16-2022 |
| 5. | 15.74 ft | on 09-03-2022 |
| 6. | 17.13 ft | on 09-01-2022 |
| 7. | 22.00 ft | on 06-03-2019 |
| 8. | 15.15 ft | on 09-24-2017 |
| 9. | 15.38 ft | on 05-22-2017 |
| 10. | 15.14 ft | on 07-22-2013 |
| 11. | 12.45 ft | on 08-16-2010 |
| 12. | 27.27 ft | on 09-20-2008 |
| 13. | 17.14 ft | on 07-26-2004 |
| 14. | 19.46 ft | on 10-12-2003 |
| 15. | 19.10 ft | on 09-24-1992 |
| 16. | 22.38 ft | on 09-29-1991 |
| 17. | 26.38 ft | on 10-03-1990 |
| 18. | 28.40 ft | on 09-30-1978 |
| 19. | 22.93 ft | on 10-04-1958 |
| 20. | 24.70 ft | on 09-27-1958 |
| 21. | 19.65 ft | on 09-10-1942 |
| 22. | 19.75 ft | on 09-23-1938 |
| 23. | 24.60 ft | on 10-03-1932 |
Historic Crests
| 1. | 28.40 ft | on 09-30-1978 |
| 2. | 27.27 ft | on 09-20-2008 |
| 3. | 26.38 ft | on 10-03-1990 |
| 4. | 24.70 ft | on 09-27-1958 |
| 5. | 24.60 ft | on 10-03-1932 |
Historic Crests
| 1. | 28.40 ft | on 09-30-1978 |
| 2. | 27.27 ft | on 09-20-2008 |
| 3. | 26.38 ft | on 10-03-1990 |
| 4. | 24.70 ft | on 09-27-1958 |
| 5. | 24.60 ft | on 10-03-1932 |
| 6. | 22.93 ft | on 10-04-1958 |
| 7. | 22.38 ft | on 09-29-1991 |
| 8. | 22.00 ft | on 06-03-2019 |
| 9. | 19.75 ft | on 09-23-1938 |
| 10. | 19.65 ft | on 09-10-1942 |
| 11. | 19.46 ft | on 10-12-2003 |
| 12. | 19.10 ft | on 09-24-1992 |
| 13. | 18.52 ft | on 09-03-2024 |
| 14. | 17.14 ft | on 07-26-2004 |
| 15. | 17.13 ft | on 09-01-2022 |
| 16. | 16.17 ft | on 09-16-2022 |
| 17. | 15.74 ft | on 07-23-2024 |
| 18. | 15.74 ft | on 09-03-2022 |
| 19. | 15.38 ft | on 05-22-2017 |
| 20. | 15.15 ft | on 09-24-2017 |
| 21. | 15.14 ft | on 07-22-2013 |
| 22. | 15.03 ft | on 09-19-2022 |
| 23. | 12.45 ft | on 08-16-2010 |
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.