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High Risk Dams in Connecticut

Connecticut has 17 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 233 high hazard dams in Connecticut, 17 (7%) have concerning condition ratings — 17 rated poor and 0 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
Crystal Lake DamMiddlesex50Poor10/18/20169 yrs agoRecreation1850
Hartford Reservoir #1 DamHartford46Poor06/20/20233 yrs agoWater Supply1868
Lake Whitney DamNew Haven44Poor04/16/20242 yrs agoWater Supply1861
Great Hill Reservior DamNew Haven41Poor09/18/20215 yrs agoRecreation1909
Peat Swamp Reservoir DamNew Haven41Poor04/26/20242 yrs agoWater Supply1925
Mad River Dam Homestead Avenue DamNew Haven31Poor11/20/201213 yrs agoWater Supply1900
North Grosvenordale DamWindham25Poor11/30/20214 yrs agoRecreation1900
Grupes Reservoir DamFairfield24Poor05/10/20215 yrs agoWater Supply1871
Factory Pond DamFairfield24Poor10/19/20232 yrs agoRecreation1874
Warren Pond DamTolland22Poor10/28/20214 yrs agoRecreation1852
Riverside Pond DamTolland21Poor04/06/20206 yrs agoWater Supply1880
Fitchville Pond DamNew London20PoorNot reportedRecreation1871
Williams Pond DamHartford17Poor10/03/20242 yrs agoRecreation1900
Silvia's Lower Pond DamNew London14Poor11/14/198639 yrs agoFish and Wildlife Pond
Mirror Lake DamTolland12Poor10/17/20232 yrs agoRecreation
Barber Pond DamHartford11Poor11/08/20187 yrs agoRecreation1955
Meadow Ridge Detention DamFairfield6Poor04/26/20242 yrs agoFlood Risk Reduction

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