gage height, Oct 23, 2026 at 2:45 PM CDT · 3 hours ago
Highest since 2015 (USGS)
9.56 ft (August 27, 2020)
Usual range
4.49 to 6.24 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
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 -4.39 ft NAVD88. It is not a water depth and not an elevation: add -4.39 ft to get the water surface elevation.
Daily highs and lows since September 11, 2026
Annual peaks since 2015
In 12 complete water years of comparable USGS records (since 2015), the highest peak was 9.56 ft on August 27, 2020. So far in water year 2027 (since October 1) the highest reading is 6.91 ft on October 1, 2026.
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
mouth-of-atchafalaya-river-at-atchafalaya-bay.csv (CSV): every reading stored for this gauge since September 11, 2026, 4,047 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.
