Lakes / New Jersey / Hunterdon County / Round Valley Reservoir
Round Valley Reservoir, New Jersey
2,272.23 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
40.62 degrees N, 74.83 degrees W - Hunterdon 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 Round Valley Reservoir Stacks Up
- Ranks #2 for surface area among the New Jersey lakes counted so far - 2,272.23 acres.
- The largest lake in Hunterdon County among those counted.
- About 20 miles from Princeton, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Cushetunk Lake | Hunterdon | 2.6 mi | 25.45 acres |
| Spruce Run Reservoir | Hunterdon | 6.1 mi | 1,354.88 acres |
| Ravine Lake | Somerset | 12 mi | 44.48 acres |
| Ingersoll Reservoir | Warren | 17 mi | 649.07 acres |
| Budd Lake | Morris | 18 mi | 389.54 acres |
| Clyde Potts Reservoir | Morris | 18 mi | 57.08 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Round Valley Reservoir
How Big Is Round Valley Reservoir?
Round Valley Reservoir covers 2,272.23 acres in Hunterdon County, New Jersey.
What Is the Largest Lake in Hunterdon County?
Round Valley Reservoir is the largest lake in Hunterdon County, at 2,272.23 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 64654488). Verified October 30, 2026.