Dams in Ohio

%!s(int=1377)Total Dams

397High Hazard

564Significant

339Low Hazard

Dam Safety in Ohio

Ohio has 1,377 dams tracked in the National Inventory of Dams. Of these, 397 (28%) are classified as high hazard — meaning failure would probably cause loss of human life — and 564 are classified as significant hazard. Currently, 509 dams in the state have a condition assessment of poor or unsatisfactory, indicating recognized safety deficiencies.

The average dam in Ohio is 64 years old. As dams age, inspection frequency and maintenance become increasingly important for ensuring public safety. The most common purpose for dams in Ohio is recreation, accounting for 891 of the state's dams.

Use the search above to find dams near any address in Ohio, or browse by county below. Each dam listing includes its hazard potential classification, condition assessment, physical characteristics, and inspection history from the NID.

Ohio Dam Facts

Total Dams	1,377
High Hazard Dams	397
Average Dam Age	64 years
Tallest Dam	300 ft
Largest Reservoir	413,000 acre-ft
Poor/Unsatisfactory Condition	509

Notable Dams in Ohio

No. 2 Slurry Pond300 ftHigh The Ohio Valley Coal Slurry Disposal Dam275 ftHigh Cardinal Fly Ash No. 2 Dam250 ftHigh Cardinal Fly Ash No. 1 Dam242 ftHigh William H. Harsha Dam205 ftHigh

Counties in Ohio

Adams14 dams3 high hazard Allen12 dams5 high hazard Ashland20 dams4 high hazard Ashtabula29 dams6 high hazard Athens10 dams7 high hazard Auglaize3 dams1 high hazard Belmont19 dams12 high hazard Brown19 dams4 high hazard Butler21 dams7 high hazard Carroll18 dams3 high hazard Champaign9 dams1 high hazard Clark8 dams2 high hazard Clermont36 dams7 high hazard Clinton20 dams8 high hazard Columbiana37 dams8 high hazard Coshocton10 dams3 high hazard Crawford9 dams5 high hazard Cuyahoga19 dams7 high hazard Darke5 dams Defiance11 dams1 high hazard Delaware25 dams14 high hazard Erie1 dams Fairfield47 dams14 high hazard Fayette3 dams1 high hazard Franklin18 dams3 high hazard Fulton10 dams5 high hazard Gallia11 dams4 high hazard Geauga29 dams9 high hazard Greene12 dams4 high hazard Guernsey30 dams4 high hazard Hamilton30 dams7 high hazard Hancock12 dams9 high hazard Hardin2 dams Harrison28 dams9 high hazard Henry1 dams Highland10 dams2 high hazard Hocking15 dams4 high hazard Holmes5 dams2 high hazard Huron22 dams10 high hazard Jackson17 dams5 high hazard Jefferson25 dams7 high hazard Knox16 dams6 high hazard Lake11 dams1 high hazard Lawrence8 dams5 high hazard Licking17 dams2 high hazard Logan12 dams3 high hazard Lorain23 dams4 high hazard Lucas7 dams2 high hazard Madison3 dams1 high hazard Mahoning21 dams7 high hazard Marion3 dams1 high hazard Medina57 dams14 high hazard Meigs8 dams2 high hazard Mercer7 dams2 high hazard Miami8 dams2 high hazard Monroe11 dams2 high hazard Montgomery12 dams5 high hazard Morgan17 dams1 high hazard Morrow14 dams3 high hazard Muskingum37 dams6 high hazard Noble13 dams3 high hazard Ottawa2 dams Paulding2 dams1 high hazard Perry30 dams11 high hazard Pickaway10 dams2 high hazard Pike9 dams5 high hazard Portage22 dams7 high hazard Preble15 dams5 high hazard Putnam3 dams1 high hazard Richland13 dams3 high hazard Ross17 dams5 high hazard Sandusky2 dams2 high hazard Scioto14 dams8 high hazard Seneca8 dams2 high hazard Shelby6 dams2 high hazard Stark39 dams5 high hazard Summit46 dams20 high hazard Trumbull21 dams5 high hazard Tuscarawas18 dams4 high hazard Union4 dams1 high hazard Van Wert3 dams3 high hazard Vinton10 dams4 high hazard Warren37 dams9 high hazard Washington17 dams5 high hazard Wayne18 dams3 high hazard Williams10 dams1 high hazard Wood8 dams4 high hazard Wyandot6 dams

High Hazard Dams in Ohio

Dam	County	Height	Condition	Purpose
No. 2 Slurry Pond	Belmont	300 ft	Not Available	Water Supply
The Ohio Valley Coal Slurry Disposal Dam	Belmont	275 ft	Not Rated	Tailings
Cardinal Fly Ash No. 2 Dam	Jefferson	250 ft	Satisfactory	Tailings
Cardinal Fly Ash No. 1 Dam	Jefferson	242 ft	Satisfactory	Tailings
William H. Harsha Dam	Clermont	205 ft	Not Available	Flood Risk Reduction
Caesar Creek Dam - Saddle Dike 2	Warren	180 ft	Not Available	Flood Risk Reduction
Muskingum River Upper Fly Ash Dam	Washington	152 ft	Fair	Tailings
Marge Schott Lake Dam	Clermont	140 ft	Satisfactory	Recreation
Sands Hill Slurry Impoundment Dam	Vinton	131 ft	Not Rated	Tailings
Meigs Mine No. 1 Slurry Impoundment	Meigs	131 ft	Not Rated	Tailings
Englewood Dam	Montgomery	121 ft	Fair	Flood Risk Reduction
Eramet Waste Retention Dam	Washington	118 ft	Satisfactory	Tailings
Mohawk Dam	Coshocton	111 ft	Not Available	Flood Risk Reduction
Germantown Dam	Montgomery	107 ft	Fair	Flood Risk Reduction
West Fork Of Mill Creek Dam	Hamilton	106 ft	Not Available	Flood Risk Reduction
Refuse Imp. (sands Hill Reservoir)	Vinton	100 ft	Not Available	Tailings
Muskingum River Middle Fly Ash Dam	Washington	100 ft	Satisfactory	Tailings
Clarence J. Brown Dam	Clark	98 ft	Not Available	Flood Risk Reduction
Berlin Dam	Mahoning	96 ft	Not Available	Flood Risk Reduction
Friendship Park Lake Dam	Jefferson	94 ft	Fair	Recreation
Stingy Run Fly Ash Dam	Gallia	93 ft	Satisfactory	Tailings
Alum Creek Dam	Delaware	93 ft	Not Available	Flood Risk Reduction
Apple Valley Lake Dam	Knox	91 ft	Poor	Recreation
Shaker Run Dam	Warren	90 ft	Fair	Recreation
Lakeview Cemetery Flood Control Dam	Cuyahoga	89 ft	Fair	Flood Risk Reduction
Wills Creek Dam	Coshocton	87 ft	Not Available	Flood Risk Reduction
Hoover Dam	Franklin	86 ft	Fair	Water Supply
Killen Station Ash Disposal Dike	Adams	84 ft	Fair	Tailings
Tom Jenkins Dam	Athens	84 ft	Not Available	Flood Risk Reduction
Michael J. Kirwan Dam	Portage	83 ft	Not Available	Flood Risk Reduction
O'shaughnessy	Delaware	79 ft	Satisfactory	Water Supply
Lockington Dam	Shelby	78 ft	Fair	Flood Risk Reduction
Taylorsville Dam	Montgomery	78 ft	Fair	Flood Risk Reduction
Barnesville Reservoir No. 3 Dam	Belmont	77 ft	Poor	Water Supply
Mckelvey Lake Dam	Mahoning	77 ft	Fair	Water Supply
Hunters Run Structure No. 9	Fairfield	76 ft	Fair	Flood Risk Reduction
Wolf Run Lake Dam	Noble	76 ft	Satisfactory	Flood Risk Reduction
Caldwell Lake Dam	Noble	75 ft	Fair	Flood Risk Reduction
Muskingum River Lower Fly Ash Dam	Washington	75 ft	Fair	Tailings
Lake Lakengren Dam	Preble	74 ft	Poor	Recreation
Rocky Fork Lake Dam	Highland	74 ft	Poor	Recreation
Leesville Dam	Carroll	74 ft	Not Available	Flood Risk Reduction
Huffman Dam	Greene	73 ft	Fair	Flood Risk Reduction
Georgetown Plant Freshwater Dam	Harrison	73 ft	Not Rated	Water Supply
North Branch Kokosing Dam	Knox	71 ft	Not Available	Flood Risk Reduction
Lake Hamilton Dam	Mahoning	70 ft	Poor	Recreation
Paint Creek Dam - Dike	Highland	70 ft	Not Available
Lake Litchfield Dam	Summit	69 ft	Satisfactory	Recreation
Timbre Ridge Dam	Lawrence	69 ft	Not Rated	Other
Chateau Lakes No. 1 Dam	Hamilton	68 ft	Fair	Recreation
International Animal Preserve Pond Dam #10	Muskingum	68 ft	Fair	Water Supply
Belmont Lake Dam	Belmont	67 ft	Poor	Recreation
Mineral Springs Resort Lake Dam	Adams	67 ft	Fair	Recreation
Hargus Lake Dam	Pickaway	66 ft	Poor	Recreation
Dow Lake Dam	Athens	66 ft	Fair	Recreation
Aston Oaks Lake Dam	Hamilton	66 ft	Fair	Flood Risk Reduction
Lake Buckhorn Dam	Holmes	65 ft	Fair	Recreation
Willard City Upground Reservoir	Huron	65 ft	Fair	Water Supply
Atwood Dam	Tuscarawas	65 ft	Not Available	Flood Risk Reduction
Old Man's Cave Lake Dam	Hocking	64 ft	Poor	Water Supply
Clendening Dam	Harrison	64 ft	Not Available	Flood Risk Reduction
Cowan Lake Dam	Clinton	63 ft	Poor	Recreation
Galley Hill Lake Dam	Clermont	63 ft	Poor	Recreation
Acton Lake Dam	Butler	62 ft	Satisfactory	Recreation
Lake Tomahawk Dam	Columbiana	62 ft	Poor	Recreation
Salt Fork Lake Dam	Guernsey	61 ft	Fair	Recreation
Mineral Ridge Dam	Trumbull	60 ft	Poor	Water Supply
Hammertown Lake Dam	Jackson	60 ft	Poor	Water Supply
Margaret Creek Structure No. 2	Athens	60 ft	Fair	Flood Risk Reduction
Allen No. 1 Dam	Perry	59 ft	Fair	Recreation
Monroe Lake Dam	Monroe	58 ft	Fair	Recreation
Meigs-phillips I No. 1 Dam	Belmont	58 ft	Fair	Recreation
Rushcreek Structure No. Vi-a	Fairfield	58 ft	Fair	Flood Risk Reduction
Candlewood Lake Dam	Morrow	58 ft	Fair	Recreation
Gorge Plant Dam	Summit	57 ft	Poor	Water Supply
Woodsfield Reservoir Dam No. 3	Monroe	56 ft	Poor	Water Supply
Forked Run Lake Dam	Meigs	56 ft	Poor	Recreation
Jisco Lake Dam	Jackson	56 ft	Poor	Recreation
Buckeye Water District Reservoir	Columbiana	56 ft	Satisfactory	Water Supply
Piedmont Dam	Harrison	56 ft	Not Available	Flood Risk Reduction
Chippewa Creek Structure Iii-a	Medina	55 ft	Satisfactory	Flood Risk Reduction
Upper Girard Lake Dam	Trumbull	55 ft	Poor	Water Supply
Sunrise Lake Dam	Warren	54 ft	Satisfactory	Recreation
Norwalk Memorial Reservoir	Huron	54 ft	Fair	Water Supply
Turkey Creek Lake Dam	Scioto	54 ft	Poor	Recreation
Glass Rock Lake Dam	Perry	54 ft	Poor	Recreation
Rush Run Lake Dam	Preble	53 ft	Fair	Recreation
Williams Reservoir	Allen	53 ft	Satisfactory	Water Supply
Hunters Run Structure No. 8	Fairfield	53 ft	Satisfactory	Flood Risk Reduction
Lake Milton Dam	Mahoning	53 ft	Poor	Recreation
Lake Waynoka Dam	Brown	53 ft	Satisfactory	Recreation
Del-co Upland Storage Reservoir No. 4	Delaware	53 ft	Fair	Water Supply
Julian Griggs Dam	Franklin	52 ft	Fair	Water Supply
Rushcreek Structure No. Vi-d	Fairfield	52 ft	Satisfactory	Flood Risk Reduction
Knox Lake Dam	Knox	52 ft	Satisfactory	Recreation
Tappan Dam	Harrison	52 ft	Not Available	Flood Risk Reduction
Charles Mill Dam	Ashland	52 ft	Not Available	Flood Risk Reduction
Lake Butler Dam	Summit	51 ft	Satisfactory	Recreation
Luburgh Lake Dam	Guernsey	51 ft	Satisfactory	Recreation
Hunters Run Structure No. 4	Fairfield	51 ft	Fair	Flood Risk Reduction