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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.

Condition scale, best to worst
  1. Satisfactory No existing or potential safety deficiencies recognized; acceptable performance expected under all loading conditions.
  2. Fair No deficiencies under normal operating conditions; a rare flood or earthquake could create one.
  3. Poor A safety deficiency is recognized under normal operating conditions; remedial action is necessary.
  4. Unsatisfactory Worst rating. The dam is considered unsafe; a deficiency requires immediate or emergency remedial action.

"Not rated" means no assessment is on file in the National Inventory of Dams.

DamCountyHeight (ft)ConditionLast inspectedPurposeYear
Liberty DamBaltimore175Unsatisfactory05/22/20242 yrs agoWater Supply1953
Druid Hill Lake Reservoir and Storage TanksBaltimore City118Poor11/13/20241 yr agoWater Supply1871
Rocky Gap DamAllegany98Poor11/26/20241 yr agoWater Supply1969
Piney Run DamCarroll73Unsatisfactory10/31/20241 yr agoWater Supply1974
Warner Gap Hollow DamWashington65Unsatisfactory09/12/20242 yrs agoWater Supply1902
Greenbrier State Park Dam & DikeWashington64Unsatisfactory12/17/20241 yr agoRecreation1965
Seneca State Park Dam (seneca Creek Road)Montgomery64Poor12/19/20241 yr agoRecreation1975
Lake LinganoreFrederick63Unsatisfactory01/29/20242 yrs agoRecreation1972
Atkisson ReservoirHarford59Unsatisfactory09/28/20224 yrs agoWater Supply1942
Fishing Creek DamFrederick58Unsatisfactory10/23/20241 yr agoWater Supply1925
Frostburg ReservoirGarrett46Poor11/06/20241 yr agoWater Supply1990
New Bald Eagle Road SwmPrince George's44Poor09/25/20242 yrs agoFlood Risk Reduction2006
Contee Main Settling PondPrince George's41Unsatisfactory08/14/20242 yrs agoTailings1973
Woodlawn Railroad Embankment on Basin RunCecil40Poor11/12/20241 yr agoOther1940
Lake Arbor (lake Arbor Way)Prince George's38Poor05/23/20242 yrs agoRecreation1971
Gilbert Run Dam 3 (jameson Dam)Charles37Unsatisfactory02/27/20242 yrs agoFlood Risk Reduction1964
Lake Whetstone Dam (montgomery Village Avenue)Montgomery36Poor03/04/20242 yrs agoRecreation1966
Prince George Country Club Dam (pleasant Prospect)Prince George's30Poor09/25/20242 yrs agoRecreation1982
Wheaton Branch Storm Water ManagementMontgomery27Poor04/22/20242 yrs agoFlood Risk Reduction1979
Lake Largo Town Center Dam (kings Way)Prince George's27Poor11/15/20241 yr agoRecreation1973
Summerfield Swm Pond No. 1 (chatsfield Way)Prince George's23Poor12/12/20241 yr agoFlood Risk Reduction1994
Beaglin Park Dam (beaglin Park Drive)Wicomico23Poor10/04/20242 yrs agoRecreation1976
Henson Creek Flood Control Dam #17Prince George's22Poor02/01/20242 yrs agoFlood Risk Reduction1992
Aragona VillagePrince George's21Poor05/23/20242 yrs agoFlood Risk Reduction1991
Laurel Lakes No 1 (lower)Prince George's21Poor11/15/20241 yr agoRecreation1986
Bowie Town Center LakePrince George's20Poor02/01/20242 yrs agoFlood Risk Reduction1990
Hanson Oaks Swm (bmp Structure 1558-002)Prince George's20Poor10/09/20242 yrs agoFlood Risk Reduction1900
Lonaconing ReservoirAllegany20Poor11/19/20241 yr agoWater Supply1895
Midland-gilmore ReservoirAllegany19Poor11/19/20241 yr agoWater Supply1903
Dry Run Detention Dam and CulvertAllegany16Poor09/12/20242 yrs agoFlood Risk Reduction1949
Summit Creek - Mount Auburn DrPrince George's15Poor11/02/20241 yr agoFlood Risk Reduction2000
Summerfield Swm Pond No. 2Prince George's15Poor05/23/20242 yrs agoFlood Risk Reduction
Coulbourn Mill Dam (south Division Street)Wicomico12Poor10/04/20242 yrs agoRecreation1947

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