USGS 08012150 Mermentau River At Mermentau, LA

PROVISIONAL DATA SUBJECT TO REVISION

Click to hidestation-specific text
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.
> WaterNow – get the latest gage data from your mobile phone or email.
> Rating Information
This station managed by the Baton Rouge Field Office.

Available Parameters Available Period
  
2000-10-01  2025-10-25
2007-10-01  2025-10-25
2023-10-01  2025-10-25
2025-06-27  2025-10-25
2025-06-27  2025-10-25







 (7)
 
  -- or --

 

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

Discharge, cubic feet per second
Most recent instantaneous value: 1070 10-25-2025   12:15 CDT
Graph of

Add up to 2 more sites and replot for "Discharge, cubic feet per second"

?
 
Note



Create presentation-quality / stand-alone graph.   Subscribe to
?
WaterAlert      

See this graph on the Monitoring Location Pages

Share this graph |

Daily discharge, cubic feet per second -- statistics for Oct 25 based on 21 water years of record more
Min
(1998)		 25th
percen-
tile		 Median Most Recent
Instantaneous
Value Oct 25		 Mean 75th
percen-
tile		 Max
(2007)
-1210 -336 432 1070 1490 2570 8580

Gage height, feet
Most recent instantaneous value: 2.44 10-25-2025   12:15 CDT
Graph of

Add up to 2 more sites and replot for "Gage height, feet"

?
 
Note



Create presentation-quality / stand-alone graph.   Subscribe to
?
WaterAlert      

See this graph on the Monitoring Location Pages

Share this graph |


Stream water level elevation above NAVD 1988, in feet, [NAVD88 GEOID18]
Most recent instantaneous value: 1.15 10-25-2025   12:15 CDT
Graph of

Add up to 2 more sites and replot for "Stream water level elevation above NAVD 1988, in feet, [NAVD88 GEOID18]"

?
 
Note



Create presentation-quality / stand-alone graph.   Subscribe to
?
WaterAlert      

See this graph on the Monitoring Location Pages

Share this graph |


Water velocity reading from field sensor, feet per second, [XVel.RA.SL.1500]
Most recent instantaneous value: 0.11 10-25-2025   12:15 CDT
Graph of

Add up to 2 more sites and replot for "Water velocity reading from field sensor, feet per second, [XVel.RA.SL.1500]"

?
 
Note



Create presentation-quality / stand-alone graph.   Subscribe to
?
WaterAlert      

See this graph on the Monitoring Location Pages

Share this graph |


Mean water velocity for discharge computation, feet per second
Most recent instantaneous value: 0.11 10-25-2025   12:15 CDT
Graph of

Add up to 2 more sites and replot for "Mean water velocity for discharge computation, feet per second"

?
 
Note



Create presentation-quality / stand-alone graph.   Subscribe to
?
WaterAlert      

See this graph on the Monitoring Location Pages

Share this graph |