Lakes / Maryland / Montgomery County / Rocky Gorge Reservoir
Rocky Gorge Reservoir, Maryland
655 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Maryland
39.13 degrees N, 76.92 degrees W - Montgomery 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 Rocky Gorge Reservoir Stacks Up
- Ranks #6 for surface area among the Maryland lakes counted so far - 655 acres.
- About 20 miles from Baltimore, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Elkhorn | Howard | 5.4 mi | 33 acres |
| Lake Kittamaqundi | Howard | 6.8 mi | 29 acres |
| Triadelphia Reservoir | Montgomery | 7.8 mi | 794 acres |
| Centennial Lake | Howard | 8.3 mi | 46 acres |
| Cash Lake | Prince George's | 9.7 mi | 56 acres |
| Redington Lake | Prince George's | 9.8 mi | 27 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Rocky Gorge Reservoir
How Big Is Rocky Gorge Reservoir?
Rocky Gorge Reservoir covers 655 acres in Montgomery County, Maryland.
What Is the Largest Lake in Montgomery County?
Triadelphia Reservoir is the largest lake in Montgomery County, at 794 acres.
Largest Lakes in Maryland
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Deep Creek Lake | Garrett | 3,679 acres | - |
| 2 | Liberty Lake | Carroll | 2,920 acres | - |
| 3 | Loch Raven Reservoir | Baltimore | 2,200 acres | - |
| 4 | Prettyboy Reservoir | Baltimore | 1,508 acres | - |
| 5 | Triadelphia Reservoir | Montgomery | 794 acres | - |
All 78 Maryland lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 81714687). Verified October 30, 2026.