Maryland Dams
425 dams tracked by the National Inventory of Dams
Total Dams
425
High Hazard
107
25.2%
Poor / Unsatisfactory
92
Average Age
60 yrs
Hazard Classification
High107 (25.2%)
Significant136 (32.0%)
Low181 (42.6%)
Condition Assessment
Satisfactory127 (29.9%)
Fair143 (33.6%)
Poor / Unsatisfactory92 (21.6%)
Not Rated63 (14.8%)
Federal
14
State
45
Local
166
Private
192
Tallest Dams
- Jennings Randolph Dam296 ft
- Savage River Dam184 ft
- Liberty Dam175 ft
- Prettyboy Dam155 ft
- T. Howard Duckett Dam139 ft
High Hazard Dams
Poor Condition Dams
- Liberty DamUnsatisfactory
- Druid Hill Lake Reservoir and Storage TanksPoor
- Rocky Gap DamPoor
- Piney Run DamUnsatisfactory
- Warner Gap Hollow DamUnsatisfactory
All Dams in Maryland
Showing 126–150 of 425
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Greencastle Lakes Dam (Ballinger Drive) Montgomery County | 36 | 1965 | Low | Satisfactory |
| Greenspring East Swm Pond No. 3 (Stream Crossing Road) Baltimore County | 34 | 1995 | Low | Poor |
| Greenspring Quarry Dam Baltimore County | 16 | 2007 | Significant | Fair |
| Gudelsky Pond Dam Montgomery County | 20 | 1987 | High | Satisfactory |
| Guilford Reservoir Storage Tanks Baltimore City County | 35 | 1893 | High | Satisfactory |
| Guilford Road Dam Howard County | — | — | Significant | Poor |
| Gunners Lake (Wisteria Drive) Montgomery County | 28 | 1985 | Significant | Satisfactory |
| Hagerstown City Park Lake (Key Street) Washington County | 10 | 1920 | Low | Satisfactory |
| Hagerstown Municipal Pwr Plant Dam Washington County | 10 | 1950 | Low | Fair |
| Hall Creek Dam Cecil County | 11 | 1930 | Significant | Unsatisfactory |
| Hallowell Swm Dam Montgomery County | 29 | 1990 | Low | Satisfactory |
| Hampstead Industrial Center Dam Carroll County | 28 | 1956 | Low | Not Rated |
| Hancock Sewage Lagoon Washington County | 8 | 1963 | Low | Satisfactory |
| Hanson Oaks Swm (Bmp Structure 1558-002) Prince George's County | 20 | 1900 | High | Poor |
| Henson Creek Flood Control Dam #17 Prince George's County | 22 | 1992 | High | Poor |
| Heritage Glen Dam Prince George's County | 12 | 2004 | Significant | Satisfactory |
| Heritage Harbour (Mastline Drive) Anne Arundel County | 34 | 1974 | Low | Fair |
| Herrington Manor Garrett County | 24 | 1938 | Low | Satisfactory |
| Hexton Farms Cecil County | 15 | 1966 | Low | Not Rated |
| Higgins Millpond Dorchester County | 9 | 1801 | Low | Not Rated |
| High Banks Talbot County | 19 | 1974 | Low | Not Rated |
| Highland Lake Howard County | 22 | 1960 | Low | Satisfactory |
| Hillen Road Water Supply Tank Baltimore City County | 36 | 1920 | High | Satisfactory |
| Hobbits Glen Golf Course Dam Howard County | 22 | 1966 | Significant | Satisfactory |
| Holly Hills Section 4 Swm Pond 1 Frederick County | 26 | 2001 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.