Hance Lake Dam is an earth dam located in Knox County, Ohio, built in 1991. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 28 ft28 ft tall and 980 ft long, taller than 62% 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 Hance Lake Dam
The primary purpose of Hance Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Terry & Leslie Henson (private). It impounds the Tributary to Armstrong Run near Mt. Vernon.
The dam stands 28 feet tall and stretches 980 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 52 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1991, the structure is 35 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 10/01/2024.
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Location
| State | Ohio |
| County | Knox |
| Nearest City | Mt. Vernon |
| River/Stream | Tributary to Armstrong Run |
| Coordinates | 40.41167, -82.57000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 980 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Normal Storage | 25 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 44 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Terry & Leslie Henson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/01/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH02802 |
| Federal ID | OH02802 |
| More Info | State Dam Safety Program |