Lake Waynoka Upground Reservoir 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 · 23 ft23 ft tall and 3,200 ft long. 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 Upground Reservoir
The primary purpose of Lake Waynoka Upground Reservoir 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 - Offstream near Arnheim.
The dam stands 23 feet tall and stretches 3,200 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 167 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. 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 - Offstream |
| Coordinates | 38.94000, -83.80139 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 3,200 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 167 acre-ft |
| Max Storage | 167 acre-ft |
| Normal Storage | 123 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 5 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 | No |
Identifiers
| NID ID | OH00164 |
| Federal ID | OH00164 |
| More Info | State Dam Safety Program |