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High Risk Dams in Maine

Maine has 19 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 75 high hazard dams in Maine, 19 (25%) have concerning condition ratings — 8 rated poor and 11 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
Libby BrookAroostook53Unsatisfactory05/11/20224 yrs agoFlood Risk Reduction1965
Grand Falls50Unsatisfactory10/12/20223 yrs agoHydroelectric1915
WoodlandWashington46Poor10/12/20223 yrs agoHydroelectric1906
Bryant PondAroostook45Unsatisfactory05/11/20224 yrs agoFlood Risk Reduction1964
JosephineAroostook31Unsatisfactory05/11/20224 yrs agoHydroelectric1967
ChristinaAroostook30Poor05/11/20224 yrs agoHydroelectric1967
Silver LakeHancock29Unsatisfactory10/12/20214 yrs agoWater Supply1930
Emery MillsYork29Poor08/12/20215 yrs agoFlood Risk Reduction1889
Grand Lake (matagamon)Penobscot25Poor11/12/20214 yrs agoHydroelectric1941
Wilson PondFranklin24Unsatisfactory07/08/20251 yr agoRecreation1845
Megunticook EastKnox18Poor09/23/20215 yrs agoFire Protection, Stock, Or Small Fish Pond1900
Lake AuburnAndroscoggin17Unsatisfactory05/05/20224 yrs agoFish and Wildlife Pond1946
Toddy PondHancock16Unsatisfactory10/12/20214 yrs agoFlood Risk Reduction1900
Appalachee PondLincoln16Unsatisfactory04/01/20224 yrs agoRecreation1922
Alamoosook LakeHancock15Unsatisfactory10/12/20214 yrs agoRecreation1930
Howard PondOxford14Poor08/03/20215 yrs agoOther1800
Megunticook WestKnox14Poor09/23/20215 yrs agoFire Protection, Stock, Or Small Fish Pond1900
North AuburnAndroscoggin12Unsatisfactory05/05/20224 yrs agoWater Supply1964
Lower West Bay PondHancock12Poor11/11/20214 yrs agoRecreation1920

← All dams in Maine · High risk dams nationwide