Lakes / New Jersey / Passaic County / Wanaque Reservoir
Wanaque Reservoir, New Jersey
1,971.09 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - New Jersey
41.07 degrees N, 74.29 degrees W - Passaic 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 Wanaque Reservoir Stacks Up
- Ranks #3 for surface area among the New Jersey lakes counted so far - 1,971.09 acres.
- The largest lake in Passaic County among those counted.
- About 21 miles from Morristown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Skyline Lakes | Passaic | 1.0 mi | 39.29 acres |
| Lake Erskine | Passaic | 2.6 mi | 77.84 acres |
| Ramapo Lake | Passaic | 2.7 mi | 95.88 acres |
| Upper Erskine Lake | Passaic | 3.0 mi | 32.62 acres |
| Lake Iosco | Passaic | 3.2 mi | 67.46 acres |
| Crystal Lake | Bergen | 3.7 mi | 25.2 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Wanaque Reservoir
How Big Is Wanaque Reservoir?
Wanaque Reservoir covers 1,971.09 acres in Passaic County, New Jersey.
What Is the Largest Lake in Passaic County?
Wanaque Reservoir is the largest lake in Passaic County, at 1,971.09 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 60462583). Verified October 30, 2026.