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Ayish Bayou near San Augustine

Highest listed crest 20.91 ftFlood stage 12.0 ft39 crests since 1958

The Ayish Bayou near San Augustine crested at major flood stage 5 times among the 39 crests the National Weather Service lists from 1958 to 2021. The highest, 20.91 ft on March 30, 2008, was major flooding, 8.91 feet above flood stage.

The gauge

Highest listed crest
20.91 ft
March 30, 2008; 39,700 cubic feet per second
Flood stage
12.0 ft
Major flooding from 17.0 ft
Crests at major
5
132nd of 370 gauges in Texas
Most recent flood crest
May 10, 2021
17.02 ft, major flooding

Flood stages

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

Flood categories, Ayish Bayou near San Augustine
Action stage11.50—The level at which the NWS or its partners begin to take action
Flood stage (minor)12.030Dec 8, 2018Minimal or no property damage, but possibly some public threat
Moderate flood stage16.04Apr 30, 2021Some inundation of structures and roads near the stream
Major flood stage17.05May 10, 2021Extensive inundation of structures and roads

Every listed crest

39 crests from 1958 to 2021. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Ayish Bayou near San Augustine, 1958 to 2021 121416182022ft Flood stage 12.0 ftMajor 17.0 ft Sep 21, 1958: 17.50 ft, major flooding; 15,900 cubic feet per secondApr 18, 1959: 14.50 ft, minor flooding; 6,100 cubic feet per secondMar 17, 1961: 13.95 ft, minor flooding; 5,000 cubic feet per secondFeb 10, 1966: 14.04 ft, minor flooding; 5,100 cubic feet per secondApr 9, 1968: 16.82 ft, moderate flooding; 13,200 cubic feet per secondSep 5, 1968: 14.00 ft, minor flooding; 5,100 cubic feet per secondMar 16, 1969: 14.03 ft, minor flooding; 5,100 cubic feet per secondApr 13, 1969: 14.14 ft, minor flooding; 5,300 cubic feet per secondApr 18, 1973: 14.15 ft, minor flooding; 5,200 cubic feet per secondJan 19, 1974: 14.00 ft, minor flooding; 5,100 cubic feet per secondSep 14, 1978: 18.02 ft, major flooding; 18,200 cubic feet per secondJan 19, 1979: 15.37 ft, minor flooding; 8,340 cubic feet per secondApr 24, 1979: 16.68 ft, moderate flooding; 12,700 cubic feet per secondDec 10, 1983: 15.16 ft, minor flooding; 7,750 cubic feet per secondMay 8, 1984: 14.10 ft, minor flooding; 5,290 cubic feet per secondNov 25, 1986: 15.09 ft, minor flooding; 7,560 cubic feet per secondMay 18, 1989: 16.59 ft, moderate flooding; 12,400 cubic feet per secondJun 1, 1990: 14.04 ft, minor flooding; 4,970 cubic feet per secondApr 18, 1991: 15.15 ft, minor flooding; 7,460 cubic feet per secondOct 17, 1994: 14.96 ft, minor flooding; 7,220 cubic feet per secondFeb 13, 1997: 14.02 ft, minor flooding; 5,140 cubic feet per secondNov 15, 1998: 12.68 ft, minor flooding; 1,980 cubic feet per secondDec 12, 2001: 14.30 ft, minor floodingMar 30, 2008: 20.91 ft, major flooding; 39,700 cubic feet per secondMar 12, 2012: 14.50 ft, minor floodingOct 31, 2013: 13.50 ft, minor floodingDec 22, 2013: 12.70 ft, minor floodingMay 19, 2015: 13.79 ft, minor flooding; 4,000 cubic feet per secondMar 9, 2016: 15.85 ft, minor flooding; 10,800 cubic feet per secondMay 28, 2016: 13.90 ft, minor flooding; 5,480 cubic feet per secondJan 19, 2017: 12.23 ft, minor flooding; 2,340 cubic feet per secondJun 4, 2017: 14.31 ft, minor flooding; 5,430 cubic feet per secondAug 30, 2017: 17.40 ft, major flooding; 15,700 cubic feet per secondFeb 22, 2018: 13.65 ft, minor flooding; 4,080 cubic feet per secondMar 29, 2018: 14.56 ft, minor flooding; 6,020 cubic feet per secondApr 7, 2018: 12.49 ft, minor flooding; 2,300 cubic feet per secondDec 8, 2018: 15.78 ft, minor flooding; 9,100 cubic feet per secondApr 30, 2021: 16.34 ft, moderate flooding; 10,700 cubic feet per secondMay 10, 2021: 17.02 ft, major flooding; 13,400 cubic feet per second Highest, 20.91 ft, Mar 30, 2008 1960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Ayish Bayou near San Augustine 1950s: 2 1960s: 6 1970s: 5 1980s: 4 1990s: 5 2000s: 2 2010s: 13 13 2020s: 2 1950s1960s1970s1980s1990s2000s2010s2020s
  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, Ayish Bayou near San Augustine
1Mar 30, 200820.91+8.91Major39,700
2Sep 14, 197818.02+6.02Major18,200
3Sep 21, 195817.50+5.50Major15,900
4Aug 30, 201717.40+5.40Major15,700
5May 10, 202117.02+5.02Major13,400
6Apr 9, 196816.82+4.82Moderate13,200
7Apr 24, 197916.68+4.68Moderate12,700
8May 18, 198916.59+4.59Moderate12,400
9Apr 30, 202116.34+4.34Moderate10,700
10Mar 9, 201615.85+3.85Minor10,800
11Dec 8, 201815.78+3.78Minor9,100
12Jan 19, 197915.37+3.37Minor8,340
13Dec 10, 198315.16+3.16Minor7,750
14Apr 18, 199115.15+3.15Minor7,460
15Nov 25, 198615.09+3.09Minor7,560
16Oct 17, 199414.96+2.96Minor7,220
17Mar 29, 201814.56+2.56Minor6,020
18Apr 18, 195914.50+2.50Minor6,100
19Mar 12, 201214.50+2.50Minor—
20Jun 4, 201714.31+2.31Minor5,430
21Dec 12, 200114.30+2.30Minor—
22Apr 18, 197314.15+2.15Minor5,200
23Apr 13, 196914.14+2.14Minor5,300
24May 8, 198414.10+2.10Minor5,290
25Feb 10, 196614.04+2.04Minor5,100
26Jun 1, 199014.04+2.04Minor4,970
27Mar 16, 196914.03+2.03Minor5,100
28Feb 13, 199714.02+2.02Minor5,140
29Sep 5, 196814.00+2.00Minor5,100
30Jan 19, 197414.00+2.00Minor5,100
31Mar 17, 196113.95+1.95Minor5,000
32May 28, 201613.90+1.90Minor5,480
33May 19, 201513.79+1.79Minor4,000
34Feb 22, 201813.65+1.65Minor4,080
35Oct 31, 201313.50+1.50Minor—
36Dec 22, 201312.70+0.70Minor—
37Nov 15, 199812.68+0.68Minor1,980
38Apr 7, 201812.49+0.49Minor2,300
39Jan 19, 201712.23+0.23Minor2,340

Other gauges in San Augustine County

Flood gauges in San Augustine County
Chireno14.029.90 ft, Jun 29, 19022

San Augustine County: every hazard · River floods across the country · Texas

NOAA National Water Prediction Service, gauge AYIT2, 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.