Gulf Coast Gauges

Lower Atchafalaya River at Morgan City water level

USGS gauge 07381600 · St. Mary Parish · Lafayette and Acadiana

3.09 ft

gage height, Oct 23, 2026 at 3:00 PM CDT · 3 hours ago

Highest since 2001 (USGS)
10.33 ft (May 29, 2011)
Usual range
2.25 to 3.47 ft

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

No National Weather Service alert covering St. Mary Parish was active when this page was generated (Oct 23, 2026 at 5:50 PM CDT). Alerts are issued and expire at any time; the current list is at alerts.weather.gov.

Last 7 days

1.4 2.4 3.5 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 -1.31 ft NAVD88. It is not a water depth and not an elevation: add -1.31 ft to get the water surface elevation.

Daily highs and lows since September 11, 2026

1.3 2.7 4.0 2026-09-11 – 2026-10-23 · bars are daily low to high

Annual peaks since 1970

In 26 complete water years of comparable USGS records (since 2001), the highest peak was 10.33 ft on May 29, 2011. So far in water year 2027 (since October 1) the highest reading is 4.02 ft on October 2, 2026.

3 5 7 9 11 1970 1980 1990 2000 2010 2020 Water year 1970: 10.33 ft on December 31, 1969 (different datum or site: not compared) Water year 1978: 4.61 ft on August 29, 1978 (different datum or site: not compared) Water year 1979: 6.71 ft on May 4, 1979 (different datum or site: not compared) Water year 1980: 5.97 ft on April 13, 1980 (different datum or site: not compared) Water year 1981: 3.84 ft on June 15, 1981 (different datum or site: not compared) Water year 1982: 4.34 ft on June 27, 1982 (different datum or site: not compared) Water year 1983: 7.11 ft on June 7, 1983 (different datum or site: not compared) Water year 1984: 6.35 ft on May 20, 1984 (different datum or site: not compared) Water year 1985: 5.82 ft on March 30, 1985 (different datum or site: not compared) Water year 1986: 5.35 ft on October 28, 1985 (different datum or site: not compared) Water year 1987: 5.51 ft on March 17, 1987 (different datum or site: not compared) Water year 1988: 4.68 ft on February 19, 1988 (different datum or site: not compared) Water year 1989: 6.00 ft on June 28, 1989 (different datum or site: not compared) Water year 1990: 6.66 ft on June 15, 1990 (different datum or site: not compared) Water year 1991: 7.36 ft on May 9, 1991 (different datum or site: not compared) Water year 1992: 8.54 ft on August 25, 1992 (different datum or site: not compared) Water year 1993: 8.54 ft on August 25, 1993 (different datum or site: not compared) Water year 1994: 7.14 ft on May 11, 1994 (different datum or site: not compared) Water year 1995: 6.69 ft on June 19, 1995 (different datum or site: not compared) Water year 1996: 5.76 ft on June 12, 1996 (different datum or site: not compared) Water year 1997: 8.24 ft on April 5, 1997 (different datum or site: not compared) Water year 1998: 6.44 ft on May 21, 1998 (different datum or site: not compared) Water year 1999: 6.37 ft on February 19, 1999 (different datum or site: not compared) Water year 2000: 4.52 ft on April 23, 2000 (different datum or site: not compared) Water year 2001: 6.29 ft on March 15, 2001 Water year 2002: 6.56 ft on June 10, 2002 Water year 2003: 7.13 ft on October 3, 2002 Water year 2004: 5.43 ft on July 3, 2004 Water year 2005: 7.24 ft on September 24, 2005 Water year 2006: 4.18 ft on March 9, 2006 Water year 2007: 5.98 ft on February 2, 2007 Water year 2008: 8.19 ft on May 3, 2008 Water year 2009: 7.20 ft on May 26, 2009 Water year 2010: 6.52 ft on February 21, 2010 Water year 2011: 10.33 ft on May 29, 2011 Water year 2012: 5.61 ft on December 26, 2011 Water year 2013: 6.29 ft on May 22, 2013 Water year 2014: 5.36 ft on April 28, 2014 Water year 2015: 6.45 ft on July 31, 2015 Water year 2016: 8.28 ft on January 22, 2016 Water year 2017: 7.47 ft on June 5, 2017 Water year 2018: 7.99 ft on March 24, 2018 Water year 2019: 10.33 ft on July 13, 2019 Water year 2020: 8.04 ft on April 20, 2020 Water year 2021: 7.28 ft on April 14, 2021 Water year 2022: 5.85 ft on March 30, 2022 Water year 2023: 5.81 ft on April 16, 2023 Water year 2024: 5.79 ft on June 5, 2024 Water year 2025: 7.20 ft on May 7, 2025 Water year 2026: 5.16 ft on July 23, 2026 Water year 2027 so far: 4.02 ft on October 2, 2026 2011 2019 2016

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 (24 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.

Download the readings

lower-atchafalaya-river-at-morgan-city.csv (CSV): every reading stored for this gauge since September 11, 2026, 4,049 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.