Lakes / Massachusetts / Hampden County / Cobble Mountain Reservoir
Cobble Mountain Reservoir, Massachusetts
1,066.49 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Massachusetts
42.14 degrees N, 72.91 degrees W - Hampden County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Massachusetts Division of Fisheries and Wildlife coordinates, not by eye. Schematic - not a survey map.
How Cobble Mountain Reservoir Stacks Up
- Ranks #9 for surface area among the Massachusetts lakes counted so far - 1,066.49 acres.
- The largest lake in Hampden County among those counted.
- About 17 miles from Springfield, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Borden Brook Reservoir | Hampden | 1.8 mi | 217.06 acres |
| Granville Reservoir | Hampden | 4.4 mi | 74.35 acres |
| Blair Pond | Hampden | 4.4 mi | 72.23 acres |
| Trout Pond | Hampden | 5.2 mi | 40.53 acres |
| Noyes Pond | Hampden | 6.3 mi | 166.05 acres |
| Cooley Lake | Hampden | 6.4 mi | 66.22 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Cobble Mountain Reservoir
How Big Is Cobble Mountain Reservoir?
Cobble Mountain Reservoir covers 1,066.49 acres in Hampden County, Massachusetts.
What Is the Largest Lake in Hampden County?
Cobble Mountain Reservoir is the largest lake in Hampden County, at 1,066.49 acres.
Deepest Natural Lakes in Massachusetts
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Walden Pond | Middlesex | 62 acres | 100 ft |
| 2 | Cliff Pond | Barnstable | 206 acres | 96 ft |
| 3 | Wallum Lake | Worcester | 322 acres | 81 ft |
| 4 | Onota Lake | Berkshire | 653 acres | 72 ft |
| 5 | Ashumet Pond | Barnstable | 220 acres | 69 ft |
All 211 Massachusetts lakes ranked by depth
Largest Lakes in Massachusetts
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Quabbin Reservoir | Franklin | 24,012 acres | - |
| 2 | Wachusett Reservoir | Worcester | 4,041 acres | - |
| 3 | Assawompset Pond | Plymouth | 2,652.37 acres | - |
| 4 | Watuppa Pond | Bristol | 1,758.37 acres | - |
| 5 | South Watuppa Pond | Bristol | 1,460 acres | 23 ft |
All 784 Massachusetts lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 132761800). Verified October 30, 2026.