High Risk Dams in Maryland
Maryland has 33 high hazard dams with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of human life and where recognized safety deficiencies have been identified.
Of the 107 high hazard dams in Maryland, 33 (30%) have concerning condition ratings — 24 rated poor and 9 rated unsatisfactory.
| Dam | County | Height (ft) | Condition | Purpose | Year |
|---|---|---|---|---|---|
| Liberty Dam | Baltimore | 175 | Unsatisfactory | Water Supply | 1953 |
| Druid Hill Lake Reservoir And Storage Tanks | Baltimore City | 118 | Poor | Water Supply | 1871 |
| Rocky Gap Dam | Allegany | 98 | Poor | Water Supply | 1969 |
| Piney Run Dam | Carroll | 73 | Unsatisfactory | Water Supply | 1974 |
| Warner Gap Hollow Dam | Washington | 65 | Unsatisfactory | Water Supply | 1902 |
| Greenbrier State Park Dam & Dike | Washington | 64 | Unsatisfactory | Recreation | 1965 |
| Seneca State Park Dam (seneca Creek Road) | Montgomery | 64 | Poor | Recreation | 1975 |
| Lake Linganore | Frederick | 63 | Unsatisfactory | Recreation | 1972 |
| Atkisson Reservoir | Harford | 59 | Unsatisfactory | Water Supply | 1942 |
| Fishing Creek Dam | Frederick | 58 | Unsatisfactory | Water Supply | 1925 |
| Frostburg Reservoir | Garrett | 46 | Poor | Water Supply | 1990 |
| New Bald Eagle Road Swm | Prince George's | 44 | Poor | Flood Risk Reduction | 2006 |
| Contee Main Settling Pond | Prince George's | 41 | Unsatisfactory | Tailings | 1973 |
| Woodlawn Railroad Embankment On Basin Run | Cecil | 40 | Poor | Other | 1940 |
| Lake Arbor (lake Arbor Way) | Prince George's | 38 | Poor | Recreation | 1971 |
| Gilbert Run Dam 3 (jameson Dam) | Charles | 37 | Unsatisfactory | Flood Risk Reduction | 1964 |
| Lake Whetstone Dam (montgomery Village Avenue) | Montgomery | 36 | Poor | Recreation | 1966 |
| Prince George Country Club Dam (pleasant Prospect) | Prince George's | 30 | Poor | Recreation | 1982 |
| Wheaton Branch Storm Water Management | Montgomery | 27 | Poor | Flood Risk Reduction | 1979 |
| Lake Largo Town Center Dam (kings Way) | Prince George's | 27 | Poor | Recreation | 1973 |
| Summerfield Swm Pond No. 1 (chatsfield Way) | Prince George's | 23 | Poor | Flood Risk Reduction | 1994 |
| Beaglin Park Dam (beaglin Park Drive) | Wicomico | 23 | Poor | Recreation | 1976 |
| Henson Creek Flood Control Dam #17 | Prince George's | 22 | Poor | Flood Risk Reduction | 1992 |
| Aragona Village | Prince George's | 21 | Poor | Flood Risk Reduction | 1991 |
| Laurel Lakes No 1 (lower) | Prince George's | 21 | Poor | Recreation | 1986 |
| Bowie Town Center Lake | Prince George's | 20 | Poor | Flood Risk Reduction | 1990 |
| Hanson Oaks Swm (bmp Structure 1558-002) | Prince George's | 20 | Poor | Flood Risk Reduction | 1900 |
| Lonaconing Reservoir | Allegany | 20 | Poor | Water Supply | 1895 |
| Midland-gilmore Reservoir | Allegany | 19 | Poor | Water Supply | 1903 |
| Dry Run Detention Dam And Culvert | Allegany | 16 | Poor | Flood Risk Reduction | 1949 |
| Summit Creek - Mount Auburn Dr | Prince George's | 15 | Poor | Flood Risk Reduction | 2000 |
| Summerfield Swm Pond No. 2 | Prince George's | 15 | Poor | Flood Risk Reduction | |
| Coulbourn Mill Dam (south Division Street) | Wicomico | 12 | Poor | Recreation | 1947 |