Williams Creek Watershed Dam 1 Reservoir Report
Last Updated: December 14, 2025
Williams Creek Watershed Dam 1, also known as Structure #1 Williams Creek, is a local government-owned earth dam located in Mosby, Missouri.
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Summary
Built in 1971 by the USDA NRCS, this dam serves the primary purpose of flood risk reduction along the TR-Williams Creek. With a height of 34 feet and a length of 1100 feet, the dam has a storage capacity of 485 acre-feet and a drainage area of 125 square miles.
Designed with a stone core and resting on a soil foundation, Williams Creek Watershed Dam 1 features an uncontrolled spillway with a width of 60 feet. Despite being classified as having a low hazard potential, the dam is considered to have moderate risk, indicating the need for ongoing monitoring and risk management measures. While the dam's condition is currently not rated, it underwent its last inspection in August 1978.
As a vital structure for flood risk reduction in the area, Williams Creek Watershed Dam 1 plays a crucial role in safeguarding the surrounding communities from potential flooding events. With its strategic location and design features, the dam continues to serve as a key component of the water resource management infrastructure in Clay County, Missouri. Climate and water resource enthusiasts can appreciate the engineering and hydrological significance of this essential dam in the region.
Year Completed |
1971 |
Dam Length |
1100 |
Dam Height |
34 |
River Or Stream |
TR-WILLIAMS CREEK |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
32 |
Drainage Area |
125 |
Nid Storage |
485 |
Structural Height |
34 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
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.
Williams Creek Watershed Dam 1