Lakes / Louisiana / Ascension County / Flat Lake
Flat Lake, Ascension County, Louisiana
37.07 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Louisiana
30.28 degrees N, 90.82 degrees W - Ascension 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 Flat Lake Stacks Up
- Larger than 10% of the 664 lakes counted in Louisiana.
- About 23 miles from Baton Rouge, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Martin | Ascension | 1.0 mi | 42 acres |
| Spanish Lake | Iberville | 13 mi | 213.25 acres |
| Lake Maurepas | Livingston | 19 mi | 58,308.4 acres |
| University Lake | East Baton Rouge | 23 mi | 195.71 acres |
| City Park Lake | East Baton Rouge | 23 mi | 52.39 acres |
| Capitol Lake | East Baton Rouge | 25 mi | 47.94 acres |
Straight-line distance between lake centers.
Facts and Figures
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 122212628). Verified October 30, 2026.