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High Risk Dams in Utah

Utah has 10 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 269 high hazard dams in Utah, 10 (3%) have concerning condition ratings — 10 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
Mountain DellSalt Lake105Poor09/08/20233 yrs agoWater Supply1916
Birch Creek No. 2Rich101Poor08/02/20233 yrs agoIrrigation1951
Lake Mary-phoebeSalt Lake72Poor08/03/20233 yrs agoWater Supply1915
Frog HollowWashington58Poor08/10/20233 yrs agoFlood Risk Reduction1978
RolfsonSanpete36Poor06/29/20233 yrs agoIrrigation1934
JonesWasatch36Poor08/29/20233 yrs agoIrrigation1956
Palisades LakeSanpete24Poor07/19/20233 yrs agoIrrigation1899
Tony Grove Lake DamCache24Poor07/29/20206 yrs agoRecreation1939
Alton ReservoirKane21Poor07/11/20233 yrs agoIrrigation
Red PineSalt Lake20Poor08/16/20233 yrs agoIrrigation1929

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