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High Risk Dams in Colorado

Colorado has 37 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 451 high hazard dams in Colorado, 37 (8%) have concerning condition ratings — 0 rated poor and 37 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
SanchezCostilla137Unsatisfactory07/22/20224 yrs agoIrrigation1911
Narraguinnep - Main DamMontezuma114Unsatisfactory05/10/20233 yrs agoIrrigation1908
Stillwater #1Garfield89Unsatisfactory10/04/20224 yrs agoIrrigation1939
MiramonteSan Miguel87Unsatisfactory05/11/20233 yrs agoRecreation1978
Spring CreekGunnison76Unsatisfactory07/10/20233 yrs agoRecreation1961
SheriffRio Blanco72Unsatisfactory10/04/20224 yrs agoIrrigation1955
Goose Pasture TarnSummit71Unsatisfactory04/27/20224 yrs agoRecreation1965
TarryallPark70Unsatisfactory06/21/20224 yrs agoRecreation1929
Julesburg #2Sedgwick67Unsatisfactory05/18/20224 yrs agoIrrigation1910
Little King RanchGrand65Unsatisfactory08/01/20224 yrs agoRecreation1968
Grass ValleyGarfield61Unsatisfactory04/06/20224 yrs agoIrrigation1892
VougaSaguache60Unsatisfactory07/08/20224 yrs agoIrrigation1978
BeckwithPueblo60Unsatisfactory04/14/20224 yrs agoIrrigation1911
Rito HondoHinsdale50Unsatisfactory06/07/20224 yrs agoRecreation1956
PenroseEl Paso50Unsatisfactory04/12/20233 yrs agoIrrigation1917
Valley No. 2El Paso48Unsatisfactory04/06/20224 yrs agoRecreation1906
Upper Long LakeJefferson46Unsatisfactory06/08/20224 yrs agoWater Supply1939
Julesburg #3Sedgwick43Unsatisfactory05/18/20224 yrs agoIrrigation1910
PrewittWashington43Unsatisfactory10/05/20224 yrs agoIrrigation1912
Summit - Main DamMontezuma42Unsatisfactory10/06/20224 yrs agoIrrigation1905
FlaglerKit Carson41Unsatisfactory06/17/20233 yrs agoRecreation1965
ApishapaLas Animas41Unsatisfactory05/12/20224 yrs agoFish and Wildlife Pond1892
SmithJefferson40Unsatisfactory03/30/20224 yrs agoIrrigation1908
Valley No. 1El Paso40Unsatisfactory04/06/20224 yrs agoRecreation1901
SkeelDenver40Unsatisfactory11/18/20223 yrs agoRecreation1900
Y T RanchMesa35Unsatisfactory05/26/20224 yrs agoRecreation1911
Julesburg #4Sedgwick34Unsatisfactory05/18/20224 yrs agoIrrigation1910
DaigreHuerfano32Unsatisfactory04/14/20233 yrs agoWater Supply1907
Leon LakeMesa30Unsatisfactory07/20/20224 yrs agoIrrigation1898
Polly A. DeaneJefferson28Unsatisfactory11/23/20214 yrs agoIrrigation1908
HyattJefferson24Unsatisfactory07/27/20224 yrs agoIrrigation1863
WindsorDenver24Unsatisfactory03/03/20224 yrs agoIrrigation1892
Julesburg #1Logan23Unsatisfactory05/18/20224 yrs agoIrrigation1910
OffieldMoffat22Unsatisfactory06/12/20233 yrs agoFire Protection, Stock, Or Small Fish Pond1914
Lower Long LakeJefferson19Unsatisfactory06/08/20224 yrs agoWater Supply1939
Julesburg #1aLogan18Unsatisfactory05/18/20224 yrs agoIrrigation1910
Summit - South DamMontezuma10Unsatisfactory10/06/20224 yrs agoIrrigation1937

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