Lakes / New Jersey / Warren County / Mountain Lake
Mountain Lake, Warren County, New Jersey
116.63 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
40.86 degrees N, 74.98 degrees W - Warren County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Mountain Lake Stacks Up
- Larger than 79% of the 295 lakes counted in New Jersey.
- About 27 miles from Morristown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Delaware Lake | Warren | 6.0 mi | 37.96 acres |
| Columbia Lake | Warren | 7.0 mi | 47.95 acres |
| Lake Susquehanna | Warren | 7.6 mi | 27.92 acres |
| Cedar Lake | Warren | 7.8 mi | 28.17 acres |
| Allamuchy Pond | Warren | 9.6 mi | 48.68 acres |
| Upper Yards Creek Reservoir | Warren | 10 mi | 269.1 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Mountain Lake
How Big Is Mountain Lake?
Mountain Lake covers 116.63 acres in Warren County, New Jersey.
What Is the Largest Lake in Warren County?
Ingersoll Reservoir is the largest lake in Warren County, at 649.07 acres.
Largest Lakes in New Jersey
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Hopatcong | Sussex | 2,493.66 acres | - |
| 2 | Round Valley Reservoir | Hunterdon | 2,272.23 acres | - |
| 3 | Wanaque Reservoir | Passaic | 1,971.09 acres | - |
| 4 | Van Sciver Lake | Burlington | 1,396.61 acres | - |
| 5 | Spruce Run Reservoir | Hunterdon | 1,354.88 acres | - |
All 295 New Jersey lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 26065176). Verified October 30, 2026.