Zion Lake Dam is an earth dam located in Harrison County, Ohio, built in 1963. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 37 ft37 ft tall and 650 ft long, taller than 83% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Zion Lake Dam
Zion Lake Dam is a dam in Harrison, Ohio. The dam is owned by Zion Foundation (private). It impounds the Jockey Hollow Run near Holloway.
The dam stands 37 feet tall and stretches 650 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 382 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1963, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 05/14/2025.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Ohio |
| County | Harrison |
| Nearest City | Holloway |
| River/Stream | Jockey Hollow Run |
| Coordinates | 40.16778, -81.08167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 650 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 382 acre-ft |
| Max Storage | 382 acre-ft |
| Normal Storage | 220 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,350 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Zion Foundation |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/14/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH00873 |
| Federal ID | OH00873 |
| More Info | State Dam Safety Program |