Willow Creek Wtrshd Site A-1 Reservoir Report
Last Updated: December 16, 2025
Willow Creek Watershed Site A-1, located in Henrietta, Missouri, is a vital structure designed by the USDA NRCS to manage flood risk in the area.
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Summary
This earth dam, completed in 1975, stands at a height of 42 feet and has a hydraulic height of 40.5 feet. It has a storage capacity of 2000 acre-feet and serves the primary purpose of flood risk reduction for the Willow Creek river.
With a drainage area of 3295 acres, Willow Creek Wtrshd Site A-1 has a spillway type of "Controlled" with a width of 120 feet. The dam's hazard potential is rated as "High," but its condition assessment is deemed "Satisfactory." The structure has undergone inspections, with the last one conducted in January 2017. Despite its high risk potential, the dam's risk management measures, emergency action plan, and inundation maps status are not explicitly mentioned in the data.
Overall, Willow Creek Watershed Site A-1 plays a crucial role in protecting the surrounding community from flooding events. The structure's design, construction, and regulatory oversight ensure that it functions effectively in reducing the risk of inundation and safeguarding the area's water resources. Its location, specifications, and history make it a noteworthy site for water resource and climate enthusiasts interested in flood management infrastructure.
Year Completed |
1975 |
Dam Length |
1100 |
Dam Height |
42 |
River Or Stream |
WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
29 |
Hydraulic Height |
40.5 |
Drainage Area |
3295 |
Nid Storage |
2000 |
Structural Height |
43 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
43 |
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 Wtrshd Site A-1