Ohio Dams

1,377 dams tracked by the National Inventory of Dams

Total Dams

1,377

High Hazard

397

28.8%

Poor / Unsatisfactory

509

Average Age

65 yrs

Hazard Classification

High397 (28.8%)

Significant564 (41.0%)

Low339 (24.6%)

Condition Assessment

Satisfactory324 (23.5%)

Fair421 (30.6%)

Poor / Unsatisfactory509 (37.0%)

Not Rated123 (8.9%)

Federal

State

115

Local

356

Private

753

Tallest Dams

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

High Hazard Dams

No. 2 Slurry PondHigh
The Ohio Valley Coal Slurry Disposal DamHigh
Cardinal Fly Ash No. 2 DamHigh
Cardinal Fly Ash No. 1 DamHigh
William H. Harsha DamHigh

Poor Condition Dams

All Dams in Ohio

Showing 1376–1377 of 1,377

All High Hazard Significant Hazard Low Hazard Poor Fair Satisfactory

Dam Name	Height (ft)	Year	Hazard	Condition
Zoldan Pond Dam Mahoning County	31	2003	Low	Satisfactory
Zupan Lake Dam Ashland County	29	2000	Low	Satisfactory

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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.