River stage
Castolon, Rio Grande
- River level
- 2.15 ft
- Status
- Below flood stage
- 7-day change
- -0.18 ft
- Recent high
- 8.65 ft
- Recent low
- 1.45 ft
Last reported 2026-10-13 | NWS CSTT2
- 30-day change
- +0.39 ft
- Average
- 2.70 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 24.70 ft
In brief
The Rio Grande at Castolon, TX read 2.15 ft on Oct 13, 2026, 10.85 ft below action stage. That is 0.39 ft higher than 30 days earlier.
Source: National Weather Service gauge CSTT2
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 24.70 ft | 1958-09-27 |
| 2 | 24.60 ft | 1932-10-03 |
| 3 | 23.25 ft | 2008-09-22 |
| 4 | 21.30 ft | 1978-09-30 |
| 5 | 21.15 ft | 1974-09-21 |
| 6 | 19.75 ft | 1938-09-23 |
| 7 | 19.67 ft | 2017-05-21 |
| 8 | 19.65 ft | 1974-09-10 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 13.00 ft
the river reaches bankfull, and no significant damage is expected.
- 15.00 ft
the river reaches minor flood stage, and lowland flooding begins. The river begins to flood the road between Santa Elena Canyon and Cottonwood Campground in Big Bend National Park. The river begins to flood the parking lot at Santa Elena Canyon, and cut off the nature trail into the canyon. Campers in Cottonwood Campground need to prepare for possible evacuations.
- 19.00 ft
the river reaches moderate flood stage, and begins flooding Cottonwood Campground. The river inundates the restrooms upstream at Santa Elena Canyon parking lot. The river begins to close all area roads.
- 24.70 ft
the river reaches record stage (1978), and results in major flooding of Cottonwood Campground. All area roads are submerged.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Rio Grande flooding at Castolon?
No. The Rio Grande at Castolon is at 2.15 ft, 10.85 ft below action stage.
What is the flood stage at Castolon?
The National Weather Service sets action stage 13 ft, minor flooding 15 ft, moderate flooding 19 ft and major flooding 24 ft.
What is the highest the Rio Grande has been at Castolon?
The highest crest on record is 24.7 ft, on 1958-09-27.
Is the Rio Grande high or low right now at Castolon?
At 2.15 ft it is higher than 45% of readings over the last 122 days.
Stage and flood information from the NOAA National Weather Service (gauge CSTT2); daily history from the U.S. Geological Survey (site 08374550). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.