Lakes / New Jersey / Morris County / Mountain Lake
Mountain Lake, Morris County, New Jersey
74.87 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
40.89 degrees N, 74.44 degrees W - Morris 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 62% of the 295 lakes counted in New Jersey.
- About 7 miles from Morristown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Boonton Reservoir | Morris | 1.9 mi | 800.95 acres |
| Cedar Lake | Morris | 2.2 mi | 92.91 acres |
| Indian Lake | Morris | 2.4 mi | 91.43 acres |
| Lake Parsippany | Morris | 2.5 mi | 155.92 acres |
| Lake Estling | Morris | 2.9 mi | 76.36 acres |
| Dixons Pond | Morris | 3.4 mi | 32.12 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Mountain Lake
How Big Is Mountain Lake?
Mountain Lake covers 74.87 acres in Morris County, New Jersey.
What Is the Largest Lake in Morris County?
Boonton Reservoir is the largest lake in Morris County, at 800.95 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 167740132). Verified October 30, 2026.