Lakes / Louisiana / Catahoula County / Old River Slough
Old River Slough, Louisiana
259.08 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Louisiana
31.51 degrees N, 91.79 degrees W - Catahoula County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Louisiana Department of Wildlife and Fisheries coordinates, not by eye. Schematic - not a survey map.
How Old River Slough Stacks Up
- Larger than 60% of the 664 lakes counted in Louisiana.
- About 82 miles from Baton Rouge, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Grassy Lake | Catahoula | 1.1 mi | 40.41 acres |
| Snaggy Lake | Catahoula | 4.7 mi | 52.94 acres |
| Black Lake | Concordia | 6.1 mi | 302.74 acres |
| Royster Lake | Catahoula | 7.5 mi | 59.53 acres |
| Donnelly Lake | Catahoula | 10 mi | 46.86 acres |
| Maknockanut Lake | Catahoula | 11 mi | 51.23 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Old River Slough
How Big Is Old River Slough?
Old River Slough covers 259.08 acres in Catahoula County, Louisiana.
What Is the Largest Lake in Catahoula County?
Larto Lake is the largest lake in Catahoula County, at 2,526.45 acres.
Deepest Natural Lakes in Louisiana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | False River | Pointe Coupee | 3,212 acres | 65 ft |
| 2 | Vernon Lake | Vernon | 6 acres | 53 ft |
| 3 | Lake Concordia | Concordia | 1,026 acres | 50 ft |
| 4 | Caney Creek Reservoir | Jackson | 4,738 acres | 43 ft |
| 5 | Lake Providence | East Carroll | 1,380 acres | 37 ft |
All 27 Louisiana lakes ranked by depth
Largest Lakes in Louisiana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Pontchartrain | Jefferson | 407,803.25 acres | - |
| 2 | Toledo Bend Reservoir | Sabine | 181,600 acres | 110 ft |
| 3 | Lake Maurepas | Livingston | 58,308.4 acres | - |
| 4 | Sabine Lake | Cameron | 56,867.74 acres | - |
| 5 | White Lake | Vermilion | 55,913.91 acres | - |
All 664 Louisiana lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 151969147). Verified October 30, 2026.