Lakes / Louisiana / St. Bernard County / Long Lagoon
Long Lagoon, Louisiana
579.16 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Louisiana
29.82 degrees N, 89.49 degrees W - St. Bernard 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 Long Lagoon Stacks Up
- Larger than 75% of the 664 lakes counted in Louisiana.
- About 36 miles from New Orleans, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Joe Shiman Pass | St. Bernard | 1.4 mi | 188.29 acres |
| Little Halfmoon Bay | St. Bernard | 1.7 mi | 465.67 acres |
| Halfmoon Pass Bay | St. Bernard | 2.0 mi | 567.7 acres |
| Deep Pass | St. Bernard | 2.2 mi | 92.45 acres |
| Blind Lagoon | St. Bernard | 2.2 mi | 106.72 acres |
| Halfmoon Lake | St. Bernard | 2.4 mi | 1,329.37 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Long Lagoon
How Big Is Long Lagoon?
Long Lagoon covers 579.16 acres in St. Bernard County, Louisiana.
What Is the Largest Lake in St. Bernard County?
Lake Lery is the largest lake in St. Bernard County, at 5,280.31 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 {650FD339-B985-4921-AD08-26A565F42940}). Verified October 30, 2026.