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High Risk Dams in Wyoming

Wyoming has 14 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 99 high hazard dams in Wyoming, 14 (14%) have concerning condition ratings — 12 rated poor and 2 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
LapreleConverse135Unsatisfactory09/08/20224 yrs agoIrrigation1909
Upper Van TassellLaramie98Poor04/28/20224 yrs agoWater Supply1932
Hawk SpringsGoshen64Poor07/17/20251 yr agoIrrigation1925
EastgateNatrona60Poor06/17/20251 yr agoFish and Wildlife Pond2010
Little Robber Det. Dam XCarbon48Poor08/04/20206 yrs agoDebris Control1953
Cardine KeithNatrona45Poor06/17/20251 yr agoIrrigation1975
LeavittBig Horn45Poor06/08/20224 yrs agoIrrigation1956
Snyder Creek Det Dam XFremont38Unsatisfactory11/06/20187 yrs agoFlood Risk Reduction2003
Silver LakeSublette32Poor07/16/20242 yrs agoIrrigation1953
North Spring CreekCarbon31Poor08/02/20233 yrs agoIrrigation1958
KemmererLincoln30Poor08/07/20251 yr agoWater Supply1942
O S WFremont28Poor04/05/20224 yrs agoIrrigation1912
Middle Piney Lake DamSublette24Poor10/11/20178 yrs agoRecreation1940
Badwater Creek DamNatrona15Poor07/16/20197 yrs agoOther

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