USGS 08012150 Mermentau River At Mermentau, LA

PROVISIONAL DATA SUBJECT TO REVISION

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Data are tidally affected--Astronomical tides cause significant cycles of approximately 24.84 hours at this site. Because a different portion of The 24.84-hour tidal cycle is averaged in successive daily (24-hour) computations, a systematic secondary oscillation, unrelated to basin hydrology and having a period of about two weeks may be apparent in daily data published from October 1984 to September 2015.
National Weather Service forecast for this station
National Weather Service station , and basin wide forcast.
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This station managed by the Baton Rouge Field Office.

Available Parameters Available Period
  
2000-10-01  2026-04-26
2007-10-01  2026-06-15
2023-10-01  2026-06-15
2026-02-15  2026-04-26







 (7)
 
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Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second
Most recent instantaneous value: *** 04-26-2026   15:30 CDT
Graph of Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Jun 15 based on 22 water years of record more
Min
(2011)		 25th
percen-
tile		 Most Recent
Instantaneous
Value Jun 15		 Median Mean 75th
percen-
tile		 Max
(2001)
-1260 -501 -- unavailable -- 312 1250 2750 7660

Gage height, feet
Most recent instantaneous value: 4.37 06-15-2026   03:15 CDT
Graph of Gage height, feet

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Stream water level elevation above NAVD 1988, in feet, [NAVD88 GEOID18]
Most recent instantaneous value: 1.21 06-15-2026   02:15 CDT
Graph of Stream water level elevation above NAVD 1988, in feet, [NAVD88 GEOID18]

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Water velocity reading from field sensor, feet per second, [XVel.RA.SL.1500]
 
-- Data temporarily unavailable for the time period specified --