Dams in Washington County, Maryland
21Total Dams
6High Hazard
6Significant
Dam Safety in Washington County, Maryland
Washington County has 21 dams tracked in the National Inventory of Dams. Of these, 6 are classified as high hazard — meaning failure would probably cause loss of human life. Another 6 carry a significant hazard classification. Currently, 6 dams have a condition assessment of poor or unsatisfactory.
The average dam in Washington County is 88 years old. The most common purpose is recreation. The tallest dam is Warner Gap Hollow Dam at 65 ft.
Explore more: Oldest dams in Maryland · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Warner Gap Hollow Dam | High | Unsatisfactory | 65 | Water Supply | 1902 |
| Greenbrier State Park Dam & Dike | High | Unsatisfactory | 64 | Recreation | 1965 |
| Blairs Valley Dam | High | Satisfactory | 34 | Recreation | 1968 |
| Kurt Sherman Dam (upper Pond) | High | Fair | 28 | Recreation | 1957 |
| Lower Lake Royer | High | Fair | 19 | Water Supply | 1898 |
| Vista Business Park | High | Satisfactory | 13 | Flood Risk Reduction | 2020 |
| Willson Water Treatment Plant Levee | Significant | Fair | 30 | Flood Risk Reduction | 1927 |
| Potomac Dam No. 5 | Significant | Not Available | 20 | Fish and Wildlife Pond | 1830 |
| Potomac River Dam #4 | Significant | Not Available | 20 | Hydroelectric | 1869 |
| Oliver Company (lower Pond) | Significant | Poor | 18 | Recreation | 1957 |
| Smithsburg Reservoir | Significant | Fair | 16 | Water Supply | 1881 |
| Volvo Hagerstown Swm | Significant | Poor | 10 | Recreation | 1961 |
| Lake Jenkins | Low | Poor | 35 | Recreation | 1936 |
| Long Hollow Dam | Low | Poor | 25 | Recreation | 1940 |
| Valley Mall Expansion Swm Dam | Low | 19 | Flood Risk Reduction | 1987 | |
| Little Tonoloway Dam | Low | Fair | 17 | Recreation | 1953 |
| Cortland Manor Swm Dam | Low | Not Rated | 15 | Flood Risk Reduction | 2006 |
| Upper Lake Royer | Low | Fair | 12 | Water Supply | 1898 |
| Hagerstown City Park Lake (key Street) | Low | Satisfactory | 10 | Recreation | 1920 |
| Hagerstown Municipal Pwr Plant Dam | Low | Fair | 10 | Water Supply | 1950 |
| Hancock Sewage Lagoon | Low | Satisfactory | 8 | Other | 1963 |