Lakes / Maryland / Montgomery County
Lakes in Montgomery County, Maryland
7 lakes counted in Montgomery County - the largest is Triadelphia Reservoir at 794 acres.
7
Lakes Counted
794 acres
Largest - Triadelphia Reservoir
Montgomery County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Triadelphia Reservoir | Montgomery | 794 acres | - |
| 2 | Rocky Gorge Reservoir | Montgomery | 655 acres | - |
| 3 | Little Seneca Lake | Montgomery | 480 acres | - |
| 4 | Clopper Lake | Montgomery | 54 acres | - |
| 5 | Lake Bernard Frank | Montgomery | 52 acres | - |
| 6 | Dalecarlia Reservoir | Montgomery | 41 acres | - |
| 7 | Lake Whetstone | Montgomery | 29 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.