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Rio Grande at Castolon

Highest listed crest 24.70 ftFlood stage 15.0 ft34 crests since 1932

The Rio Grande at Castolon crested at major flood stage 2 times among the 34 crests the National Weather Service lists from 1932 to 2026. The highest, 24.70 ft on September 27, 1958, was major flooding, 9.70 feet above flood stage. 2 other gauges on the Rio Grande crested above flood stage within a week of it.

The gauge

Highest listed crest
24.70 ft
September 27, 1958
Flood stage
15.0 ft
Major flooding from 24.0 ft
Crests at major
2
218th of 370 gauges in Texas
Most recent flood crest
October 26, 2026
15.18 ft, minor flooding
Location
Brewster County
Texas

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Rio Grande at Castolon
Action stage13.02Aug 16, 2010The level at which the NWS or its partners begin to take action
Flood stage (minor)15.020Oct 26, 2026Minimal or no property damage, but possibly some public threat
Moderate flood stage19.010Jul 4, 2025Some inundation of structures and roads near the stream
Major flood stage24.02Sep 27, 1958Extensive inundation of structures and roads

Every listed crest

34 crests from 1932 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Rio Grande at Castolon, 1932 to 2026 1015202530ft Flood stage 15.0 ftMajor 24.0 ft Oct 3, 1932: 24.60 ft, major floodingSep 23, 1938: 19.75 ft, moderate floodingSep 27, 1958: 24.70 ft, major floodingSep 10, 1974: 19.65 ft, moderate floodingSep 21, 1974: 21.15 ft, moderate floodingSep 30, 1978: 21.30 ft, moderate floodingOct 3, 1990: 19.00 ft, moderate floodingSep 27, 1991: 18.40 ft, minor floodingOct 11, 2003: 18.50 ft, minor floodingSep 22, 2008: 23.25 ft, moderate flooding; 59,092 cubic feet per secondMay 12, 2009: 18.00 ft, minor floodingJun 20, 2009: 16.56 ft, minor floodingOct 7, 2009: 15.15 ft, minor floodingApr 15, 2010: 13.08 ft, action stageAug 16, 2010: 13.85 ft, action stage; 11,364 cubic feet per secondOct 13, 2012: 16.01 ft, minor flooding; 17,268 cubic feet per secondSep 7, 2014: 15.58 ft, minor flooding; 15,911 cubic feet per secondAug 26, 2016: 17.64 ft, minor flooding; 26,404 cubic feet per secondMay 21, 2017: 19.67 ft, moderate flooding; 34,145 cubic feet per secondAug 2, 2017: 15.43 ft, minor flooding; 18,946 cubic feet per secondAug 21, 2017: 15.32 ft, minor flooding; 14,959 cubic feet per secondAug 25, 2017: 15.26 ft, minor flooding; 14,783 cubic feet per secondMay 11, 2020: 16.23 ft, minor flooding; 17,881 cubic feet per secondSep 9, 2020: 17.10 ft, minor flooding; 20,878 cubic feet per secondSep 1, 2022: 19.03 ft, moderate flooding; 18,783 cubic feet per secondOct 11, 2022: 17.42 ft, minor flooding; 14,297 cubic feet per secondMay 28, 2023: 19.40 ft, moderate flooding; 20,345 cubic feet per secondJul 23, 2024: 16.16 ft, minor flooding; 11,628 cubic feet per secondSep 3, 2024: 17.74 ft, minor flooding; 15,070 cubic feet per secondJun 30, 2025: 15.98 ft, minor flooding; 11,288 cubic feet per secondJul 4, 2025: 19.35 ft, moderate flooding; 20,088 cubic feet per secondJul 20, 2026: 17.99 ft, minor flooding; 15,702 cubic feet per secondSep 25, 2026: 17.81 ft, minor flooding; 15,245 cubic feet per secondOct 26, 2026: 15.18 ft, minor flooding; 9,863 cubic feet per second Highest, 24.70 ft, Sep 27, 1958 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Rio Grande at Castolon 1930s: 2 1940s: 0 1950s: 1 1960s: 0 1970s: 3 1980s: 0 1990s: 2 2000s: 5 2010s: 7 2020s: 12 12 1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Rio Grande at Castolon
1Sep 27, 195824.70+9.70Major—
2Oct 3, 193224.60+9.60Major—
3Sep 22, 200823.25+8.25Moderate59,092
4Sep 30, 197821.30+6.30Moderate—
5Sep 21, 197421.15+6.15Moderate—
6Sep 23, 193819.75+4.75Moderate—
7May 21, 201719.67+4.67Moderate34,145
8Sep 10, 197419.65+4.65Moderate—
9May 28, 202319.40+4.40Moderate20,345
10Jul 4, 202519.35+4.35Moderate20,088
11Sep 1, 202219.03+4.03Moderate18,783
12Oct 3, 199019.00+4.00Moderate—
13Oct 11, 200318.50+3.50Minor—
14Sep 27, 199118.40+3.40Minor—
15May 12, 200918.00+3.00Minor—
16Jul 20, 202617.99+2.99Minor15,702
17Sep 25, 202617.81+2.81Minor15,245
18Sep 3, 202417.74+2.74Minor15,070
19Aug 26, 201617.64+2.64Minor26,404
20Oct 11, 202217.42+2.42Minor14,297
21Sep 9, 202017.10+2.10Minor20,878
22Jun 20, 200916.56+1.56Minor—
23May 11, 202016.23+1.23Minor17,881
24Jul 23, 202416.16+1.16Minor11,628
25Oct 13, 201216.01+1.01Minor17,268
26Jun 30, 202515.98+0.98Minor11,288
27Sep 7, 201415.58+0.58Minor15,911
28Aug 2, 201715.43+0.43Minor18,946
29Aug 21, 201715.32+0.32Minor14,959
30Aug 25, 201715.26+0.26Minor14,783
31Oct 26, 202615.18+0.18Minor9,863
32Oct 7, 200915.15+0.15Minor—
33Aug 16, 201013.85−1.15Action11,364
34Apr 15, 201013.08−1.92Action—

The worst floods along the Rio Grande

For this gauge's highest crests, the other gauges on the Rio Grande that crested above flood stage within a week.

September 27, 1958: 24.70 ft here, major flooding

October 3, 1932: 24.60 ft here, major flooding

September 22, 2008: 23.25 ft here, moderate flooding

Gauges on the Rio Grande

Flood gauges sharing the river's name, linked within 80 miles of one another.

Flood gauges on the Rio Grande
Boquillas CrossingTX13.025.50 ft, Oct 3, 19784
Castolon this gaugeTX15.024.70 ft, Sep 27, 19582
Johnson RanchTX15.028.40 ft, Sep 30, 197813
Presidio International BridgeTX15.528.21 ft, Sep 16, 20085

Other gauges in Brewster County

Flood gauges in Brewster County
Boquillas Crossing13.025.50 ft, Oct 3, 19784
Johnson Ranch15.028.40 ft, Sep 30, 197813

Brewster County: every hazard · River floods across the country · Texas

NOAA National Water Prediction Service, gauge CSTT2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.