Lakes / Louisiana / Concordia County / Lake Saint John
Lake Saint John, Louisiana
2,126.93 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Louisiana
31.71 degrees N, 91.45 degrees W - Concordia 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 Lake Saint John Stacks Up
- Larger than 89% of the 664 lakes counted in Louisiana.
- The largest lake in Concordia County among those counted.
- About 89 miles from Baton Rouge, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Big Blue Hole | Concordia | 3.0 mi | 100.32 acres |
| Fletchers Lake | Tensas | 4.1 mi | 361.94 acres |
| Mud Lake | Concordia | 4.9 mi | 237.96 acres |
| Boggy Lake | Tensas | 5.4 mi | 247.17 acres |
| Lake Concordia | Concordia | 5.9 mi | 1,026 acres |
| Gorton Chute | Tensas | 6.4 mi | 55.35 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Saint John
How Big Is Lake Saint John?
Lake Saint John covers 2,126.93 acres in Concordia County, Louisiana.
What Is the Largest Lake in Concordia County?
Lake Saint John is the largest lake in Concordia County, at 2,126.93 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 {cffb0e21-0b5f-4260-a0b0-e83b7f46810e}). Verified October 30, 2026.