Lakes / New Jersey / Mercer County / Gropp Lake
Gropp Lake, New Jersey
30.64 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
40.19 degrees N, 74.69 degrees W - Mercer 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 Gropp Lake Stacks Up
- Larger than 13% of the 295 lakes counted in New Jersey.
- About 12 miles from Princeton, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Spring Lake | Mercer | 2.5 mi | 62.02 acres |
| Mercer County Lake | Mercer | 5.7 mi | 290.09 acres |
| Van Sciver Lake | Burlington | 5.9 mi | 1,396.61 acres |
| Manor Lake | Burlington | 6.2 mi | 441.33 acres |
| Grovers Mill Pond | Mercer | 9.4 mi | 31.14 acres |
| Rosedale Lake | Mercer | 10 mi | 29.87 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Gropp Lake
How Big Is Gropp Lake?
Gropp Lake covers 30.64 acres in Mercer County, New Jersey.
What Is the Largest Lake in Mercer County?
Mercer County Lake is the largest lake in Mercer County, at 290.09 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 25485000). Verified October 30, 2026.