Lakes / Massachusetts / Essex County / Longham Reservoir
Longham Reservoir, Massachusetts
40.97 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Massachusetts
42.59 degrees N, 70.86 degrees W - Essex 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 Longham Reservoir Stacks Up
- Larger than 31% of the 784 lakes counted in Massachusetts.
- About 19 miles from Boston, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Norwood Pond | Essex | 0.8 mi | 54.78 acres |
| Wenham Lake | Essex | 1.4 mi | 248 acres |
| Pleasant Pond | Essex | 2.1 mi | 29 acres |
| Beck Pond | Essex | 2.2 mi | 38 acres |
| Round Pond | Essex | 2.4 mi | 38.84 acres |
| Chebacco Lake | Essex | 3.0 mi | 213 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Longham Reservoir
How Big Is Longham Reservoir?
Longham Reservoir covers 40.97 acres in Essex County, Massachusetts.
What Is the Largest Lake in Essex County?
Lake Cochichewick is the largest lake in Essex County, at 574.77 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 135694173). Verified October 30, 2026.