Gulf Coast Gauges

Chocolate Bayou near Alvin water level

USGS gauge 08078000 · Brazoria County

11.29 ft

gage height, Oct 23, 2026 at 1:15 PM CDT · 50 minutes ago

Highest since 1989 (USGS)
34.06 ft (August 29, 2017)
Usual range
11.23 to 11.65 ft

USGS marks recent readings as provisional: they can be revised after review.

Active National Weather Service alerts for Brazoria County

Text as issued by NWS Houston/Galveston TX.

Last 7 days

11.2 11.4 11.7 Oct 17 Oct 18 Oct 19 Oct 20 Oct 21 Oct 22 Oct 23

Hourly averages of USGS readings. The shaded band is this gauge's usual range: the middle 80% of its readings since September 11, 2026.

How to read this gauge

Gage height is the height of the water surface above this gauge's own zero point, which sits at -1.48 ft NAVD88. It is not a water depth and not an elevation: add -1.48 ft to get the water surface elevation.

Daily highs and lows since September 11, 2026

11.2 12.7 14.2 2026-09-11 – 2026-10-23 · bars are daily low to high

Annual peaks since 1939

In 38 complete water years of comparable USGS records (since 1989), the highest peak was 34.06 ft on August 29, 2017. So far in water year 2027 (since October 1) the highest reading is 12.70 ft on October 3, 2026.

1 10 19 28 36 1940 1950 1960 1970 1980 1990 2000 2010 2020 Water year 1939: 19.90 ft on July 14, 1939 (different datum or site: not compared) Water year 1948: 14.76 ft on February 25, 1948 (different datum or site: not compared) Water year 1949: 12.99 ft on April 23, 1949 (different datum or site: not compared) Water year 1950: 18.80 ft on October 8, 1949 (different datum or site: not compared) Water year 1951: 12.66 ft on September 14, 1951 (different datum or site: not compared) Water year 1952: 16.33 ft on April 1, 1952 (different datum or site: not compared) Water year 1953: 16.69 ft on August 31, 1953 (different datum or site: not compared) Water year 1954: 16.93 ft on November 19, 1953 (different datum or site: not compared) Water year 1955: 15.97 ft on February 7, 1955 (different datum or site: not compared) Water year 1956: 3.72 ft on May 2, 1956 (different datum or site: not compared) Water year 1957: 17.10 ft on March 18, 1957 (different datum or site: not compared) Water year 1958: 13.25 ft on October 16, 1957 (different datum or site: not compared) Water year 1959: 19.03 ft on August 27, 1959 (different datum or site: not compared) Water year 1960: 18.46 ft on June 27, 1960 (different datum or site: not compared) Water year 1961: 20.10 ft on June 19, 1961 (different datum or site: not compared) Water year 1962: 18.88 ft on November 14, 1961 (different datum or site: not compared) Water year 1963: 14.38 ft on December 24, 1962 (different datum or site: not compared) Water year 1964: 9.18 ft on February 5, 1964 (different datum or site: not compared) Water year 1965: 18.56 ft on December 11, 1964 (different datum or site: not compared) Water year 1966: 18.97 ft on February 10, 1966 (different datum or site: not compared) Water year 1967: 9.75 ft on February 6, 1967 (different datum or site: not compared) Water year 1968: 20.34 ft on June 24, 1968 (different datum or site: not compared) Water year 1969: 16.82 ft on February 22, 1969 (different datum or site: not compared) Water year 1970: 16.55 ft on September 17, 1970 (different datum or site: not compared) Water year 1971: 19.41 ft on September 11, 1971 (different datum or site: not compared) Water year 1972: 19.07 ft on May 13, 1972 (different datum or site: not compared) Water year 1973: 20.82 ft on June 13, 1973 (different datum or site: not compared) Water year 1974: 19.05 ft on May 11, 1974 (different datum or site: not compared) Water year 1975: 19.66 ft on June 1, 1975 (different datum or site: not compared) Water year 1976: 16.71 ft on June 17, 1976 (different datum or site: not compared) Water year 1977: 17.51 ft on April 21, 1977 (different datum or site: not compared) Water year 1978: 13.76 ft on June 4, 1978 (different datum or site: not compared) Water year 1979: 23.88 ft on July 26, 1979 (different datum or site: not compared) Water year 1980: 18.90 ft on January 23, 1980 (different datum or site: not compared) Water year 1981: 19.63 ft on May 4, 1981 (different datum or site: not compared) Water year 1982: 15.70 ft on May 15, 1982 (different datum or site: not compared) Water year 1983: 19.80 ft on August 20, 1983 (different datum or site: not compared) Water year 1984: 14.04 ft on January 10, 1984 (different datum or site: not compared) Water year 1985: 19.69 ft on March 16, 1985 (different datum or site: not compared) Water year 1986: 13.61 ft on November 13, 1985 (different datum or site: not compared) Water year 1987: 14.69 ft on November 25, 1986 (different datum or site: not compared) Water year 1988: 21.44 ft on April 30, 1988 (different datum or site: not compared) Water year 1989: 30.98 ft on August 3, 1989 Water year 1990: 28.57 ft on May 5, 1990 Water year 1991: 29.26 ft on April 6, 1991 Water year 1992: 29.66 ft on May 29, 1992 Water year 1993: 29.03 ft on June 21, 1993 Water year 1994: 28.59 ft on October 21, 1993 Water year 1995: 30.94 ft on October 20, 1994 Water year 1996: 29.44 ft on December 18, 1995 Water year 1997: 30.12 ft on April 12, 1997 Water year 1998: 29.99 ft on September 12, 1998 Water year 1999: 30.05 ft on November 15, 1998 Water year 2000: 23.35 ft on May 20, 2000 Water year 2001: 31.25 ft on September 2, 2001 Water year 2002: 30.57 ft on August 16, 2002 Water year 2003: 29.40 ft on October 25, 2002 Water year 2004: 29.59 ft on May 15, 2004 Water year 2005: 28.17 ft on November 21, 2004 Water year 2006: 24.07 ft on September 25, 2006 Water year 2007: 31.25 ft on October 17, 2006 Water year 2008: 24.27 ft on January 19, 2008 Water year 2009: 29.28 ft on April 20, 2009 Water year 2010: 30.50 ft on July 3, 2010 Water year 2011: 24.02 ft on December 30, 2010 Water year 2012: 29.45 ft on May 13, 2012 Water year 2013: 22.11 ft on January 10, 2013 Water year 2014: 29.21 ft on November 1, 2013 Water year 2015: 29.04 ft on January 23, 2015 Water year 2016: 29.08 ft on November 1, 2015 Water year 2017: 34.06 ft on August 29, 2017 Water year 2018: 26.29 ft on February 11, 2018 Water year 2019: 30.05 ft on May 11, 2019 Water year 2020: 26.45 ft on October 22, 2019 Water year 2021: 28.94 ft on September 15, 2021 Water year 2022: 22.14 ft on October 2, 2021 Water year 2023: 26.74 ft on November 26, 2022 Water year 2024: 30.82 ft on July 9, 2024 Water year 2025: 26.54 ft on June 13, 2025 Water year 2026: 29.57 ft on June 22, 2026 Water year 2027 so far: 12.70 ft on October 3, 2026 2017 2001 2007

Each dot is the highest gage height of a water year (October to September), from the USGS annual peak record, with recent years USGS has not published yet taken from its 15-minute readings and this site's own; hover a dot for its date. Dashed lines are NWS flood stages. Grey hollow dots (42 years) were measured on a different datum or at a different site, or before the gauge's datum last changed, so they are shown but not compared.

In past storms

StormPeakPeak timeRiseCompared with its record
October 1–2, 202612.70 ftOct 3, 2026 at 8:00 AM CDT1.2 fthighest since water year 2026 (29.57 ft on June 22, 2026)

Download the readings

chocolate-bayou-near-alvin.csv (CSV): every reading stored for this gauge since September 11, 2026, 4,036 rows, with time in UTC and Central, gage height in feet, and the USGS approval status.

Source. Gage height from the U.S. Geological Survey. This site is not affiliated with either agency.