Grand Bayou Reservoir at spillway near Coushatta water level

Name: Grand Bayou Reservoir at spillway near Coushatta water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Reservoir, Grand Bayou Reservoir, Louisiana, United States

Directions

Very low for late October

Surface elevation

133.64ft Steady over the last 24 hours

Measured Oct 21, 2026, 02:30 AM CDT (1 hour ago)

Water level: 40.27 ft

History

What this means

Water is short at Grand Bayou Reservoir at spillway near Coushatta: the latest reading of 133.64 ft is far below normal for late October.

A year ago it stood at 137.65 ft (−4.01 ft).

The level has held steady over the past 24 hours. The 30-day range is 133.59 ft – 134.76 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.

Compared with 5 years of daily readings for this time of year. How to read levels

Key numbers

Same day last year: 137.65 ft−4.01 ft
Lowest and highest in 30 days: 133.59 ft – 134.76 ft
Lowest and highest in 12 months: 133.64 ft – 139.47 ft

Boating and fishing at Grand Bayou Reservoir at spillway near Coushatta

At low levels, launching can mean a long walk or a closed ramp, and shallow points stick out further than charts suggest.

Conditions at the shore change with the level, so check with the agency that runs the lake before a trip.

Weather at the gauge

No rain in the last 3 days.

21 Wed 83° 49° – Wind 6 mph

22 Thu 86° 53° – Wind 7 mph

23 Fri 87° 56° – Wind 7 mph

24 Sat 84° 56° – Wind 7 mph

25 Sun 82° 53° – Wind 7 mph

26 Mon 83° 56° – Wind 5 mph

27 Tue 67° 60° 0.08 in Wind 8 mph

Forecast: Open-Meteo

Sunrise 07:21 AM Sunset 06:35 PM Daylight 11 hr, 14 min Waxing gibbous 75%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Bayou Pierre near PowhatanRiver gauge, Bayou Pierre	11.55 ft	Normal	+0.06 ft	10 mi
Bayou Pierre near Lake EndRiver gauge, Bayou Pierre	5.52 ft	Normal	+0.04 ft	10 mi
Black Lake Bayou near ClarenceLake, Black Lake Bayou	8.40 ft	High	−0.01 ft	17 mi
Saline Bayou near LuckyRiver gauge, Saline Bayou	3.57 ft	Normal	±0	22 mi
Flat River at High IslandRiver gauge, Flat River	8.03 ft	Normal	−0.17 ft	22 mi
Lake Bistineau near RinggoldLake, Lake Bistineau	133.52 ft	Below flood stage	−0.03 ft	26 mi
Bayou San Patricio near BensonRiver gauge, Bayou San Patricio	5.93 ft	Low	−0.02 ft	27 mi
Dugdemona River near JonesboroRiver gauge, Dugdemona River	3.37 ft	Very low	−0.01 ft	28 mi

Questions and answers

How does Grand Bayou Reservoir at spillway near Coushatta compare with last year?

It is 4.01 ft lower than on the same day last year, when the reading was 137.65 ft.

Is Grand Bayou Reservoir at spillway near Coushatta really 133.64 ft deep?

No. 133.64 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Grand Bayou Reservoir at spillway near Coushatta today?

On Oct 21, 2026, 02:30 AM CDT, the surface elevation was 133.64 ft. Steady over the last 24 hours.

Is Grand Bayou Reservoir at spillway near Coushatta rising or falling?

Steady over the last 24 hours.

Is the level of Grand Bayou Reservoir at spillway near Coushatta normal?

Very low for late October. Compared with 5 years of daily readings for this time of year.

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:07352820 (Agency page)
Coordinates: 31.99879, -93.21327 (WGS84)
Vertical datum: NGVD29
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Surface elevation	133.64 ft	2026-10-21 07:30	Provisional
Water level	40.27 ft	2026-10-21 07:30	Provisional

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How to cite

U.S. Geological Survey: Grand Bayou Reservoir at spillway near Coushatta (usgs:07352820). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/louisiana/grand-bayou-reservoir-at-spillway-near-coushatta

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