Wellington Nap C-22 Reservoir Report

Last Updated: December 9, 2025

Wellington Nap C-22, located in Lafayette, Missouri, is a crucial structure designed by the USDA NRCS for flood risk reduction along the TR to Missouri River.


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Summary

Completed in 1970, this earth dam stands at a height of 36 feet and stretches 515 feet in length, with a storage capacity of 177 acre-feet. With a drainage area of 680 acres and a maximum discharge of 2402 cubic feet per second, this dam plays a significant role in managing water flow and reducing flood risks in the region.

Owned by the local government and regulated by the DAM AND RESERVOIR SAFETY PROG, Wellington Nap C-22 is classified as having a high hazard potential but is currently in satisfactory condition. The dam's spillway type is uncontrolled with a width of 70 feet, and it serves multiple purposes including debris control and flood risk reduction. Despite being inspected every five years, the last assessment was conducted in December 2007, showcasing the importance of regular monitoring and maintenance to ensure the safety and functionality of this critical water resource infrastructure.

Although Wellington Nap C-22 has not experienced any recent modifications, its risk assessment indicates a moderate level of risk (3). With no outlet gates and a surface area of 14 acres, this dam remains a key component in the water management infrastructure of the region. As climate change continues to impact water resources, structures like Wellington Nap C-22 play a vital role in mitigating flood risks and ensuring the safety and resilience of communities in Lafayette, Missouri.

Year Completed

1970

Dam Length

515

Dam Height

36

River Or Stream

TR TO MISSOURI RIVER

Primary Dam Type

Earth

Surface Area

14

Drainage Area

680

Nid Storage

177

Structural Height

36

Outlet Gates

None

Hazard Potential

High

Foundations

Soil

Nid Height

36
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.