Ralph Hennemann Lake is an earth dam located in Scott County, Missouri, built in 1992. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 386 ft long, taller than 50% 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 Ralph Hennemann Lake
The primary purpose of Ralph Hennemann Lake is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Ralph Hennemann (private). It impounds the Ramsey Creek near Kelso.
The dam stands 25 feet tall and stretches 386 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 212 acre-feet, and collects water from a drainage area of 128 square miles. Completed in 1992, the structure is 34 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.
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Location
| State | Missouri |
| County | Scott |
| Nearest City | Kelso |
| River/Stream | Ramsey Creek |
| Coordinates | 37.13580, -89.53432 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 386 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 212 acre-ft |
| Max Storage | 212 acre-ft |
| Normal Storage | 170 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 128 sq mi |
| Max Discharge | 239 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Ralph Hennemann |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO50849 |
| Federal ID | MO50849 |
| More Info | State Dam Safety Program |