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Frio River near Derby

Highest listed crest 29.45 ftFlood stage 6.0 ft18 crests since 1932

The Frio River near Derby crested at major flood stage 7 times among the 18 crests the National Weather Service lists from 1932 to 2026. The highest, 29.45 ft on July 4, 1932, was major flooding, 23.45 feet above flood stage. 3 other gauges on the Frio River crested above flood stage within a week of it, 1 at its own highest listed crest.

The gauge

Highest listed crest
29.45 ft
July 4, 1932; 230,000 cubic feet per second
Flood stage
6.0 ft
Major flooding from 17.0 ft
Crests at major
7
90th of 370 gauges in Texas
Most recent flood crest
July 18, 2026
20.51 ft, major flooding
Location
Frio County
Texas

Flood stages

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

Flood categories, Frio River near Derby
Action stage6.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)6.00—Minimal or no property damage, but possibly some public threat
Moderate flood stage7.011Oct 18, 2018Some inundation of structures and roads near the stream
Major flood stage17.07Jul 18, 2026Extensive inundation of structures and roads

Every listed crest

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

Listed crests at the Frio River near Derby, 1932 to 2026 51015202530ft Flood stage 6.0 ftMajor 17.0 ft Jul 4, 1932: 29.45 ft, major flooding; 230,000 cubic feet per secondJun 2, 1935: 23.70 ft, major flooding; 68,300 cubic feet per secondApr 25, 1981: 9.97 ft, moderate flooding; 6,490 cubic feet per secondJun 18, 1981: 11.17 ft, moderate flooding; 9,580 cubic feet per secondMay 31, 1987: 17.29 ft, major flooding; 33,800 cubic feet per secondJul 18, 1990: 11.03 ft, moderate flooding; 9,180 cubic feet per secondDec 23, 1991: 11.65 ft, moderate flooding; 11,100 cubic feet per secondMar 6, 1992: 9.79 ft, moderate flooding; 6,100 cubic feet per secondJun 24, 1997: 21.77 ft, major flooding; 56,400 cubic feet per secondJul 7, 2002: 19.87 ft, major floodingJul 21, 2007: 22.02 ft, major floodingMay 26, 2015: 13.66 ft, moderate flooding; 16,400 cubic feet per secondSep 11, 2018: 8.81 ft, moderate flooding; 4,840 cubic feet per secondSep 18, 2018: 9.95 ft, moderate flooding; 7,110 cubic feet per secondSep 24, 2018: 9.02 ft, moderate flooding; 5,209 cubic feet per secondOct 12, 2018: 9.09 ft, moderate flooding; 5,340 cubic feet per secondOct 18, 2018: 9.40 ft, moderate flooding; 5,947 cubic feet per secondJul 18, 2026: 20.51 ft, major flooding Highest, 29.45 ft, Jul 4, 1932 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Frio River near Derby 1930s: 2 1940s: 0 1950s: 0 1960s: 0 1970s: 0 1980s: 3 1990s: 4 2000s: 2 2010s: 6 6 2020s: 1 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, Frio River near Derby
1Jul 4, 193229.45+23.45Major230,000
2Jun 2, 193523.70+17.70Major68,300
3Jul 21, 200722.02+16.02Major—
4Jun 24, 199721.77+15.77Major56,400
5Jul 18, 202620.51+14.51Major—
6Jul 7, 200219.87+13.87Major—
7May 31, 198717.29+11.29Major33,800
8May 26, 201513.66+7.66Moderate16,400
9Dec 23, 199111.65+5.65Moderate11,100
10Jun 18, 198111.17+5.17Moderate9,580
11Jul 18, 199011.03+5.03Moderate9,180
12Apr 25, 19819.97+3.97Moderate6,490
13Sep 18, 20189.95+3.95Moderate7,110
14Mar 6, 19929.79+3.79Moderate6,100
15Oct 18, 20189.40+3.40Moderate5,947
16Oct 12, 20189.09+3.09Moderate5,340
17Sep 24, 20189.02+3.02Moderate5,209
18Sep 11, 20188.81+2.81Moderate4,840

The worst floods along the Frio River

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

July 4, 1932: 29.45 ft here, major flooding

  • ConcanTX · Jul 1, 1932 · 34.40 ft · Major · its highest
  • Dry Frio near UvaldeTX · Jul 1, 1932 · 30.00 ft · Major
  • TildenTX · Jul 2, 1932 · 28.20 ft · Major

July 21, 2007: 22.02 ft here, major flooding

  • TildenTX · Jul 28, 2007 · 27.11 ft · Major

June 24, 1997: 21.77 ft here, major flooding

Gauges on the Frio River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Frio River
ConcanTX11.034.40 ft, Jul 1, 193213
Dry Frio near UvaldeTX12.035.00 ft, Jan 1, 18947
Derby this gaugeTX6.029.45 ft, Jul 4, 19327
TildenTX22.030.06 ft, Jul 10, 200210

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

NOAA National Water Prediction Service, gauge DBYT2, 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.