Gulf Coast Gauges

Black Bayou east of Gonzales water level

USGS gauge 073802245 · Ascension Parish · Baton Rouge · NWS gauge BBGL1

1.57 ft

gage height, Oct 23, 2026 at 2:45 PM CDT · 2 hours ago

Highest since 1997 (USGS)
9.60 ft (August 16, 2016)
Usual range
1.29 to 2.41 ft

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

No National Weather Service alert covering Ascension Parish was active when this page was generated (Oct 23, 2026 at 5:05 PM CDT). Alerts are issued and expire at any time; the current list is at alerts.weather.gov.

Last 7 days

1.3 1.9 2.4 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 the gauge's zero point. This gauge's zero is set at 0 ft NAVD88, so its gage height is the water surface elevation above that datum. It is not a water depth.

Daily highs and lows since September 11, 2026

0.9 1.7 2.6 2026-09-11 – 2026-10-23 · bars are daily low to high

Annual peaks since 1997

In 30 complete water years of comparable USGS records (since 1997), the highest peak was 9.60 ft on August 16, 2016. So far in water year 2027 (since October 1) the highest reading is 2.57 ft on October 9, 2026, higher than the annual peak in 1 of 30 years.

1 4 6 8 10 2000 2005 2010 2015 2020 2025 Water year 1997: 5.94 ft on June 18, 1997 Water year 1998: 6.34 ft on September 12, 1998 Water year 1999: 3.79 ft on June 26, 1999 Water year 2000: 1.99 ft on December 21, 1999 Water year 2001: 6.46 ft on June 8, 2001 Water year 2002: 4.48 ft on September 26, 2002 Water year 2003: 5.22 ft on April 8, 2003 Water year 2004: 3.46 ft on May 12, 2004 Water year 2005: 5.19 ft on September 24, 2005 Water year 2006: 4.35 ft on April 30, 2006 Water year 2007: 4.23 ft on December 22, 2006 Water year 2008: 3.31 ft on May 15, 2008 Water year 2009: 4.47 ft on March 27, 2009 Water year 2010: 4.69 ft on December 8, 2009 Water year 2011: 3.35 ft on September 3, 2011 Water year 2012: 6.08 ft on August 3, 2012 Water year 2013: 5.52 ft on January 9, 2013 Water year 2014: 5.58 ft on May 28, 2014 Water year 2015: 4.01 ft on April 14, 2015 Water year 2016: 9.60 ft on August 16, 2016 Water year 2017: 4.65 ft on August 29, 2017 Water year 2018: 4.43 ft on April 14, 2018 Water year 2019: 4.24 ft on April 4, 2019 Water year 2020: 4.87 ft on May 15, 2020 Water year 2021: 5.96 ft on May 18, 2021 Water year 2022: 2.83 ft on April 14, 2022 Water year 2023: 4.39 ft on December 30, 2022 Water year 2024: 4.13 ft on April 10, 2024 Water year 2025: 3.04 ft on July 17, 2025 Water year 2026: 3.70 ft on May 9, 2026 Water year 2027 so far: 2.57 ft on October 9, 2026 2016 2001 1998

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.

NWS historic crests

DateCrestAbove minor flood stage
August 15, 20168.48 ft—
June 8, 20016.46 ft—
August 30, 20126.08 ft—
January 9, 20135.52 ft—
December 8, 20094.69 ft—
March 27, 20094.47 ft—
April 30, 20064.35 ft—
December 30, 20064.23 ft—

The highest crests the National Weather Service lists for this gauge, as published. They can differ from the USGS annual peaks above: USGS records the year's highest gage height, which is not always the crest the NWS lists for the same flood.

Download the readings

black-bayou-east-of-gonzales.csv (CSV): every reading stored for this gauge since September 11, 2026, 4,048 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.