Wellington Nap D-21b is an earth dam located in Lafayette County, Missouri, built in 1973. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 43 ft43 ft tall and 400 ft long, taller than 89% 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 Wellington Nap D-21b
The primary purpose of Wellington Nap D-21b 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 Laf Soil&wtr Strct Dist (local government). It impounds the Tr-missouri River near Waterloo.
The dam stands 43 feet tall and stretches 400 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 105 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1973, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 04/27/2021.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Missouri |
| County | Lafayette |
| Nearest City | Waterloo |
| River/Stream | Tr-missouri River |
| Coordinates | 39.13171, -94.05350 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 43 ft |
| Dam Length | 400 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 105 acre-ft |
| Max Storage | 105 acre-ft |
| Normal Storage | 36 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,258 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Laf Soil&wtr Strct Dist |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/27/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MO12001 |
| Federal ID | MO12001 |
| More Info | State Dam Safety Program |