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High Risk Dams in Ohio

Ohio has 132 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 397 high hazard dams in Ohio, 132 (33%) have concerning condition ratings — 128 rated poor and 4 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
Apple Valley Lake DamKnox91Poor11/12/20241 yr agoRecreation1971
Barnesville Reservoir No. 3 DamBelmont77Poor11/14/20223 yrs agoWater Supply1965
Lake Lakengren DamPreble74Poor05/20/20215 yrs agoRecreation1970
Rocky Fork Lake DamHighland74Poor06/06/20233 yrs agoRecreation1952
Lake Hamilton DamMahoning70Poor12/14/20214 yrs agoRecreation1905
Belmont Lake DamBelmont67Poor11/10/20223 yrs agoRecreation1961
Hargus Lake DamPickaway66Poor10/18/20178 yrs agoRecreation1956
Old Man's Cave Lake DamHocking64Poor11/14/20223 yrs agoWater Supply1972
Cowan Lake DamClinton63Poor06/11/20242 yrs agoRecreation1947
Galley Hill Lake DamClermont63Poor05/14/20242 yrs agoRecreation1960
Lake Tomahawk DamColumbiana62Poor05/30/20242 yrs agoRecreation1966
Mineral Ridge DamTrumbull60Poor07/08/20215 yrs agoWater Supply1932
Hammertown Lake DamJackson60Poor11/03/20223 yrs agoWater Supply1954
Gorge Plant DamSummit57Poor12/06/20214 yrs agoWater Supply1912
Woodsfield Reservoir Dam No. 3Monroe56Poor04/09/20251 yr agoWater Supply1992
Forked Run Lake DamMeigs56Poor05/25/20224 yrs agoRecreation1952
Jisco Lake DamJackson56Poor11/03/20223 yrs agoRecreation1952
Upper Girard Lake DamTrumbull55Poor10/12/20214 yrs agoWater Supply1929
Turkey Creek Lake DamScioto54Poor05/17/20233 yrs agoRecreation1966
Glass Rock Lake DamPerry54Poor11/09/20232 yrs agoRecreation
Lake Milton DamMahoning53Poor04/20/201610 yrs agoRecreation1916
Briarwood Sportsman's Club No. 11 DamLogan50Poor10/22/20241 yr agoRecreation1976
Varkony Pond DamHarrison49Poor11/03/20223 yrs agoRecreation
Ross Lake DamRoss48Poor11/14/20223 yrs agoRecreation1967
Barnesville Reservoir No. 2 DamBelmont48Poor11/14/20223 yrs agoWater Supply1936
Salem Reservoir (south Embankment)Columbiana48Poor06/18/20242 yrs agoWater Supply1952
Lake Viering DamKnox47Poor11/05/20241 yr agoRecreation1964
New Lexington Reservoir DamPerry45Poor06/16/20224 yrs agoWater Supply1936
Roaming Rock Shores Lake DamAshtabula45Poor10/26/20214 yrs agoRecreation1967
Highlandtown Lake DamColumbiana44Poor06/27/20197 yrs agoRecreation1966
Nimisila Reservoir DamSummit44Poor08/20/20206 yrs agoWater Supply1936
Clear Fork Reservoir DamRichland44Poor11/21/20241 yr agoWater Supply1949
Wolf Creek DamSummit43Poor07/07/20206 yrs agoWater Supply1926
Lilley Lake DamWarren43Poor05/16/20242 yrs agoRecreation1954
Lake Logan DamHocking43Poor05/23/20224 yrs agoRecreation1954
Lake Mohawk DamCarroll42Poor07/23/20206 yrs agoRecreation1963
Lake Choctaw DamMadison42Poor11/16/20223 yrs agoRecreation1964
Margaret Creek Structure No. 6Athens42Poor05/04/20224 yrs agoFlood Risk Reduction1967
Wellston Reservoir DamJackson41Poor05/11/20215 yrs agoWater Supply1920
Amick Upground ReservoirMorrow40Poor12/08/20205 yrs agoWater Supply1968
Paradise Lakes - South Lake DamPreble40Poor04/22/20215 yrs agoRecreation1946
Lake Rupert DamVinton40Poor05/11/20215 yrs agoWater Supply1968
Hinckley Lake DamMedina40Poor12/05/20232 yrs agoRecreation1928
Bridge Creek DamGeauga40Poor10/05/20215 yrs agoWater Supply1961
Seven Springs Lake DamMedina40Poor10/25/20232 yrs agoRecreation1961
Stevens Lake DamHarrison39Poor10/24/20223 yrs agoRecreation1963
Lost Creek Upground ReservoirAllen38Poor05/24/20224 yrs agoWater Supply1917
Southern Silica Pond No. 2 DamRoss38Poor09/06/20224 yrs agoRecreation1956
Dale Walborn Reservoir DamStark37Poor11/17/20214 yrs agoWater Supply1971
Sally Buffalo Park Lake DamHarrison37Poor10/24/20223 yrs agoRecreation1953
Forest Hill Park Dam No. 2Cuyahoga37Poor04/26/20233 yrs agoFlood Risk Reduction1963
Big Bear Lake DamScioto37Poor11/22/20223 yrs agoFlood Risk Reduction1972
Schloss Pond DamGeauga36Poor10/26/20214 yrs agoRecreation1952
Mogadore Reservoir DamPortage36Poor04/20/20233 yrs agoRecreation1938
Lake Seneca DamWilliams36Poor06/06/20233 yrs agoRecreation1966
Lake Rockwell DamPortage35Poor04/20/20233 yrs agoWater Supply1913
Guilford Lake DamColumbiana35Poor05/09/20242 yrs agoRecreation1933
Adams Lake DamAdams34Poor05/10/20233 yrs agoRecreation1947
East Branch Reservoir DamGeauga34Poor10/05/20215 yrs agoWater Supply1939
Findley Lake DamLorain33Poor12/13/20232 yrs agoRecreation1956
Lake Grant DamBrown32Poor05/24/20233 yrs agoRecreation1948
Barnesville Lake DamBelmont32Poor11/14/20223 yrs agoRecreation1969
Lake Damascus DamKnox31Poor10/30/20205 yrs agoRecreation2010
Izaak Walton Lake DamLawrence31Poor04/29/20215 yrs agoRecreation
Lake Lucerne DamGeauga30Poor06/14/20233 yrs agoRecreation1922
Deer Lake DamMuskingum30Poor11/21/20232 yrs agoRecreation1957
Upper Shaker Lake DamCuyahoga30Unsatisfactory03/29/20233 yrs agoRecreation1852
Rio Grande ReservoirGallia30Poor06/17/20215 yrs agoRecreation1959
Remick Lake DamWarren29Poor05/06/20215 yrs agoRecreation1966
Spring Valley Park Lake DamColumbiana29Poor06/18/20242 yrs agoWater Supply1993
Tycoon Lake DamGallia29Poor11/08/20214 yrs agoRecreation1961
Powers Upground ReservoirCrawford28Poor12/08/20205 yrs agoWater Supply1954
Long's Retreat Lake DamPike28Poor11/22/20223 yrs agoRecreation1970
Muskingum College Lake DamMuskingum28Poor11/15/20223 yrs agoRecreation1935
Lake Katharine DamJackson27Poor11/03/20223 yrs agoRecreation1945
Hunters Run Structure No. 3Fairfield27Poor06/21/20224 yrs agoFlood Risk Reduction1960
Bibbee's Little Rock Lake DamColumbiana27Poor04/09/20242 yrs agoRecreation1960
Comet Lake DamSummit26Poor05/19/20251 yr agoRecreation1922
Pine Lake Estates DamFairfield26Poor04/28/20224 yrs agoRecreation1962
Pine Lake DamLogan25Poor10/22/20241 yr agoRecreation
Lake Cable DamStark25Poor04/24/20251 yr agoRecreation1926
Shreve Lake DamWayne25Unsatisfactory11/07/20196 yrs agoRecreation1962
Lake Mosier Upground ReservoirHancock25Poor06/24/20215 yrs agoWater Supply1941
Coalburg Lake DamTrumbull24Poor11/21/20196 yrs agoRecreation1916
Waller Lake DamLawrence24Poor11/24/20205 yrs agoRecreation1955
Hunters Run Structure R-42Fairfield24Poor06/21/20224 yrs agoFlood Risk Reduction1959
Classicway Farm Lake DamWarren24Poor05/01/20242 yrs agoRecreation1965
Lake Loramie DamShelby23Poor11/07/20241 yr agoRecreation1844
Camp Spelman Lake DamPortage23Poor09/13/20215 yrs agoRecreation
Clark Lake DamClark23Poor10/29/20241 yr agoRecreation1957
Hollenbeck Lake DamCuyahoga22Poor11/02/20214 yrs agoRecreation1953
Ashtabula County Outdoor Club Lake DamAshtabula22Poor05/23/20233 yrs agoRecreation1928
Delta Reservoir No. 1Fulton22Poor06/21/20224 yrs agoWater Supply1933
Archbold Upground Reservoir No. 2Fulton22Poor06/20/20233 yrs agoWater Supply1961
Pine Valley Sportsmen's Lake No. 4 DamJefferson22Poor11/02/20223 yrs agoRecreation1964
Franz Pond DamMiami21Poor11/26/20241 yr agoWater Supply1876
Horace Troop Pond DamDelaware21Poor12/16/20205 yrs agoRecreation1956
San Toy DamPerry21Poor04/13/20224 yrs agoRecreation1916
Belmont Hills Country Club Lake DamBelmont21Poor10/11/20223 yrs agoWater Supply1940
Swan Lake DamSummit20Poor12/15/20232 yrs agoRecreation1995
Pleasant Valley Lake DamTrumbull20Poor09/22/20215 yrs agoRecreation1925
Greenwich Reservoir DamHuron20Poor05/27/20215 yrs agoRecreation1921
Knox Cattle Company DamKnox20Unsatisfactory08/28/20242 yrs agoRecreation1945
Grand Lake St. Marys - West EmbankmentMercer20Poor11/20/20241 yr agoRecreation1841
Altiers Lake DamPerry19Poor04/13/20224 yrs agoRecreation1949
Naji Lake DamAshtabula19Poor10/28/20214 yrs agoRecreation1963
The Baltic Sportsman Lake DamTuscarawas19Poor04/30/20251 yr agoRecreation1957
Indian Lakes Rec. Area Lower Lake DamGuernsey19Poor11/15/20223 yrs agoRecreation1962
Lake Lamberjack Upground ReservoirHancock19Poor06/24/20215 yrs agoWater Supply1919
Bucyrus Reservoir No. 1 DamCrawford18Poor06/08/20233 yrs agoRecreation1900
Bellevue Upground Reservoir No. 4Huron18Poor05/03/20233 yrs agoWater Supply1919
Artesian Lake DamAshland18Poor10/10/20241 yr agoRecreation
Bellevue Upground Reservoir No. 3Huron18Poor05/03/20233 yrs agoWater Supply1900
Sally Buffalo Park Lake No. 4 DamHarrison18Poor10/24/20223 yrs agoRecreation1953
Grand Lake St. Marys - East EmbankmentAuglaize18Poor11/20/20241 yr agoRecreation1841
Lower Jeffco Lake DamAshtabula17Poor11/24/20214 yrs agoRecreation1963
Lower Shaker Lake DamCuyahoga17Poor03/29/20233 yrs agoRecreation1830
Indian Lake DamLogan16Poor11/26/20241 yr agoRecreation1852
Blanchester Reservoir No. 4 DamClinton16Unsatisfactory06/25/20242 yrs agoWater Supply1950
Lake Alma DamVinton16Poor04/27/20215 yrs agoRecreation1902
Brimfield Lake DamPortage16Poor12/01/20214 yrs agoRecreation1959
Blanchester Reservoir No. 3 DamClinton15Poor06/25/20242 yrs agoWater Supply1934
Cedarville Upground ReservoirGreene15Poor05/23/20242 yrs ago1963
Archbold Upground Reservoir No. 1Fulton15Poor06/20/20233 yrs agoWater Supply1957
Fayetteville High School Lake DamBrown15Poor04/24/20242 yrs agoRecreation
Echo Lake DamMiami14Poor11/26/20241 yr agoWater Supply1876
Bellevue Upground Reservoir No. 1Huron14Poor05/03/20233 yrs agoWater Supply1874
North Reservoir DamSummit13Poor08/18/201511 yrs agoRecreation1840
Sally Buffalo Park Lake No. 2 DamHarrison13Poor10/24/20223 yrs agoRecreation1953
Ridgewood Lake DamMedina12Poor11/04/20214 yrs agoRecreation1965
Hickory Hills Park Lake DamPortage12Poor12/01/20214 yrs agoRecreation1958
Brye Lake DamMedina12Poor06/04/20251 yr agoRecreation1988

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