Lake Waynoka Retention Dam is an earth dam located in Brown County, Ohio, built in 1973. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 32 ft32 ft tall and 370 ft long, taller than 74% 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 Lake Waynoka Retention Dam
The primary purpose of Lake Waynoka Retention Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Waynoka Regional Water & Sewer District (local government). It impounds the Sycamore Run near Arnheim.
The dam stands 32 feet tall and stretches 370 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 296 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1973, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/09/2023.
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Location
| State | Ohio |
| County | Brown |
| Nearest City | Arnheim |
| River/Stream | Sycamore Run |
| Coordinates | 38.94139, -83.80556 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 370 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 296 acre-ft |
| Max Storage | 296 acre-ft |
| Normal Storage | 89 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 4,125 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Waynoka Regional Water & Sewer District |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/09/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH00163 |
| Federal ID | OH00163 |
| More Info | State Dam Safety Program |