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 176–200 of 425
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mill Creek Dam Dorchester County | 11 | 1930 | Low | Not Rated |
| Milestone Swm Pond No. 4 Montgomery County | 26 | 1995 | Low | Satisfactory |
| Midland-Gilmore Reservoir Allegany County | 19 | 1903 | High | Poor |
| Mezick Farm Pond Queen Anne's County | 16 | 1974 | Low | Fair |
| Medford Quarry Wash Pond Carroll County | 26 | 1988 | Significant | Fair |
| Meadow Run Dam Garrett County | 38 | 1969 | High | Fair |
| Md Route 104 Swm Pond (Sha Bmp 130077) Howard County | 17 | 1990 | Significant | Poor |
| Mc Allister Pond No. 1 Charles County | 22 | 1967 | Low | Poor |
| Mays Chapel Reservoir Baltimore County | 20 | 1965 | High | Satisfactory |
| Masonville Dmcf Baltimore City County | 18 | — | Low | Satisfactory |
| Mason-Dixon Water Supply Pond Cecil County | 67 | 1966 | Low | Satisfactory |
| Mason Dixon Original Settling Pond Cecil County | 52 | 1966 | Low | Satisfactory |
| Mason-Dixon Farms Irrigation Pond Frederick County | 15 | 1984 | Low | Not Rated |
| Mary Lee Lane Swm Dam Howard County | 11 | 1985 | Significant | Satisfactory |
| Martin Luther King Jr. Park Dam Montgomery County | 27 | 1978 | Low | Fair |
| Martindale Pond Harford County | 20 | 1975 | Significant | Poor |
| Marlton South Swm Dam Prince George's County | 24 | 2000 | Low | Fair |
| Manchester Farm Regional Swm Pond Dam Montgomery County | 21 | 1996 | Significant | Fair |
| Madison Hill Swm Pond 1 (Silk Tree Drive) Prince George's County | 18 | 1994 | Significant | Fair |
| Lutheran Village At Millers Grant Pond 1 (Vals Lane) Howard County | 18 | 2015 | Significant | Satisfactory |
| Lower Lake Royer Washington County | 19 | 1898 | High | Fair |
| Long Hollow Dam Washington County | 25 | 1940 | Low | Poor |
| Lonaconing Reservoir Allegany County | 20 | 1895 | High | Poor |
| Loch Raven Dam Baltimore County | 130 | 1923 | High | Satisfactory |
| Little Youghiogheny Site 7 Garrett County | 45 | 1960 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.