Mary Elmer Lake
| Mary Elmer Lake | |
|---|---|
| Location | Hopewell Township / Bridgeton, Cumberland County, New Jersey |
| Coordinates | 39°26′47″N 75°15′02″W / 39.4465°N 75.2506°W |
| Type | reservoir |
| Catchment area | 7.5 sq mi (19 km2) |
| Basin countries | United States |
| Surface area | 22 acres (8.9 ha) |
Mary Elmer Lake is a reservoir on the Cohansey River in Cumberland County, New Jersey, used for water-supply and recreation purposes.