Gulf Coast Gauges

Mermentau River at Lake Arthur water level

USGS gauge 08012400 · Jefferson Davis Parish · Lake Charles and Southwest Louisiana

22.24 ft

gage height, Oct 23, 2026 at 2:15 PM CDT · 3 hours ago

Highest since 1957 (USGS)
25.04 ft (April 5, 2025)
Usual range
22.23 to 22.47 ft

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

No National Weather Service alert covering Jefferson Davis 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

21.8 22.1 22.5 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 -22.37 ft NAVD88. It is not a water depth and not an elevation: add -22.37 ft to get the water surface elevation.

Daily highs and lows since September 11, 2026

21.8 22.2 22.6 2026-09-11 – 2026-10-23 · bars are daily low to high

Annual peaks since 1957

In 34 complete water years of comparable USGS records (since 1957), the highest peak was 25.04 ft on April 5, 2025. So far in water year 2027 (since October 1) the highest reading is 22.58 ft on October 12, 2026, higher than the annual peak in 30 of 34 years.

2 8 14 20 27 1960 1970 1980 1990 2000 2010 2020 Water year 1957: 6.60 ft on June 30, 1957 Water year 1958: 3.78 ft on September 23, 1958 Water year 1959: 4.95 ft on February 5, 1959 Water year 1960: 4.00 ft on December 20, 1959 Water year 1961: 4.81 ft on February 24, 1961 Water year 1962: 4.00 ft on December 21, 1961 Water year 1963: 3.78 ft on September 21, 1963 Water year 1964: 4.02 ft on March 4, 1964 Water year 1965: 4.67 ft on March 4, 1965 Water year 1966: 5.56 ft on February 18, 1966 Water year 1967: 6.07 ft on April 18, 1967 Water year 1968: 3.88 ft on January 3, 1968 Water year 1969: 6.11 ft on April 18, 1969 Water year 1970: 3.33 ft on September 26, 1970 Water year 1971: 4.14 ft on October 28, 1970 Water year 1972: 7.36 ft on December 10, 1971 Water year 1973: 6.14 ft on April 21, 1973 Water year 1974: 5.81 ft on January 28, 1974 Water year 1975: 4.94 ft on January 13, 1975 Water year 1976: 4.32 ft on March 29, 1976 Water year 1977: 6.45 ft on April 25, 1977 Water year 1978: 4.80 ft on December 12, 1977 Water year 1985: 5.60 ft on October 26, 1984 Water year 1986: 8.20 ft on November 3, 1985 Water year 1987: 4.84 ft on January 23, 1987 Water year 1988: 4.90 ft on April 5, 1988 Water year 1990: 5.69 ft on January 30, 1990 Water year 1991: 5.86 ft on May 17, 1991 Water year 1992: 4.87 ft on January 23, 1992 Water year 1993: 5.09 ft on November 19, 1992 Water year 2023: 24.47 ft on February 4, 2023 Water year 2024: 24.36 ft on May 22, 2024 Water year 2025: 25.04 ft on April 5, 2025 Water year 2026: 23.89 ft on May 27, 2026 Water year 2027 so far: 22.58 ft on October 12, 2026 2025

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.

Download the readings

mermentau-river-at-lake-arthur.csv (CSV): every reading stored for this gauge since September 11, 2026, 4,046 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.