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Mermentau River @ Lake Arthur water level

River gauge, Louisiana, United States

Directions

Latest reading

Water level

22.28ft Steady over the last 24 hours

20 23 25

History

21.822.022.222.4ftOct 16Oct 17Oct 18Oct 19Oct 2021.822.022.222.4ftOct 16Oct 18Oct 20
22.022.222.4ftSep 21Sep 28Oct 5Oct 12Oct 2022.022.222.4ftSep 21Oct 5Oct 20
2223ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20262223ftOct 2025Apr 2026Oct 2026
2223ftJanMarMayJulSepNov20262223ftJanAprJulOct2026

20252026

Water level

What this means

The U.S. Geological Survey has Mermentau River @ Lake Arthur at 22.28 ft. There is no published reference for this river yet, so we can't say whether that is high or low for the season.

It has barely moved over the past 24 hours. The 30-day range is 21.84 ft – 22.54 ft.

Over the past seven days the change adds up to −0.26 ft.

The agency publishes no normal range for this gauge yet, so we show the trend only. How to read levels

Key numbers

Same day last year
22.56 ft−0.28 ft
Lowest and highest in 30 days
21.84 ft – 22.54 ft
Lowest and highest in 12 months
21.96 ft – 23.79 ft

Paddling and fishing conditions

Compare today with the chart before you go; local outfitters often know which stage suits their stretch.

Weather at the gauge

The forecast is not available right now.

Sunrise 07:16 AM Sunset 06:36 PM Daylight 11 hr, 19 min First quarter 66%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Mermentau River At MermentauRiver gauge 1.96 ft Normal +0.04 ft 9 mi
Bayou Queue De Tortue @ RicevilleRiver gauge 4.74 ft Below flood stage +0.03 ft 9 mi
Bayou Lacassine near Lake ArthurRiver gauge, Bayou Lacassine 10.09 ft Very high +0.03 ft 13 mi
Bayou Plaquemine Brule @ EsterwoodRiver gauge 7.53 ft Below flood stage +0.06 ft 15 mi
Bayou Des Cannes west of IotaRiver gauge 11.19 ft Below flood stage +0.04 ft 19 mi
Bayou Mallet at Hwy 91 north of IotaRiver gauge, Bayou Mallet 1.74 ft Very low −0.07 ft 24 mi
Bayou Nezpique near BasileRiver gauge, Bayou Nezpique 1.73 ft Low ±0 28 mi
Bayou Des Cannes near EuniceRiver gauge, Bayou Des Cannes 0.08 ft Very low −0.02 ft 30 mi

Questions and answers

Is Mermentau River @ Lake Arthur higher than last year?

No, it is 0.28 ft lower than on the same day last year, when the reading was 22.56 ft.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Mermentau River @ Lake Arthur today?

On Oct 20, 2026, 01:15 AM CDT, the water level was 22.28 ft. Steady over the last 24 hours.

Is Mermentau River @ Lake Arthur rising or falling?

Steady over the last 24 hours. Down 0.26 ft over the last 7 days.

Is the level of Mermentau River @ Lake Arthur normal?

The agency publishes no normal range for this gauge yet, so we show the trend only.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Geological Survey
Station code
usgs:08012400 (Agency page)
Coordinates
30.07283, -92.65928 (WGS84)
Vertical datum
NAVD88
Update interval
every 15 minutes
Licence
Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Water level 22.28 ft 2026-10-20 06:15 Provisional

Download

Embed this gauge

Add a live card for this gauge to your website. It updates on its own and links back here.

How to cite

U.S. Geological Survey: Mermentau River @ Lake Arthur (usgs:08012400). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/louisiana/mermentau-river-lake-arthur

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer