Willow Creek Watershed Dam C- 21 Reservoir Report
Last Updated: December 16, 2025
Willow Creek Watershed Dam C- 21, also known as Ray CO Dam C-21, is a local government-owned Grade Stabilization dam located in Henrietta, Missouri.
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Summary
Built in 1972 by the USDA NRCS, this Earth-type dam stands at a height of 31 feet and has a length of 600 feet. With a storage capacity of 180 acre-feet and a drainage area of 400 acres, the dam serves the primary purpose of Grade Stabilization along TR-WILLOW CREEK.
Despite being classified as having a low hazard potential, Willow Creek Watershed Dam C- 21 is also rated as having a moderate risk level. The dam features an uncontrolled spillway with a width of 30 feet and no outlet gates. Its condition is currently listed as "Not Rated," with the last inspection conducted in May 1979. The dam has not been modified in recent years and does not have an Emergency Action Plan in place, indicating a need for ongoing monitoring and risk assessment to ensure the safety and stability of the structure.
Located in Ray County, Missouri, Willow Creek Watershed Dam C- 21 is a vital part of the local water resource management system. As a key infrastructure for mitigating erosion and stabilizing the surrounding area, this dam plays an important role in protecting the environment and ensuring the resilience of the watershed. With its unique design and historical significance, Willow Creek Watershed Dam C- 21 serves as a reminder of the importance of sustainable water resource management practices in the face of changing climate conditions.
Year Completed |
1972 |
Dam Length |
600 |
Dam Height |
31 |
River Or Stream |
TR-WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
31 |
Drainage Area |
400 |
Nid Storage |
180 |
Structural Height |
33 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Willow Creek Watershed Dam C- 21