Grindstone-Lost-Muddy Watershed Dam C-75 Reservoir Report
Last Updated: December 5, 2025
Located in DeKalb County, Missouri, the Grindstone-Lost-Muddy Watershed Dam C-75 is a key structure designed for grade stabilization by the USDA NRCS.
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Summary
Built in 1973, this earth dam stands at a height of 24 feet and spans 580 feet across TR-LOST CREEK. With a storage capacity of 120 acre-feet and a drainage area of 240 acres, the dam plays a crucial role in managing water resources in the region.
The dam's primary purpose is grade stabilization, serving to control soil erosion and prevent sediment runoff into the surrounding waterways. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3, highlighting the importance of ongoing monitoring and maintenance. With a spillway width of 40 feet and uncontrolled spillway type, the dam is equipped to handle a maximum discharge of 295 cubic feet per second in the event of heavy rainfall or flooding, ensuring the safety of downstream communities.
While the dam's condition is currently not rated, its strategic location in the Grindstone-Lost-Muddy watershed underscores its significance in water resource management efforts. With a focus on sustainability and risk mitigation, the dam serves as a vital infrastructure asset in protecting the local environment and enhancing climate resilience in the region.
Year Completed |
1973 |
Dam Length |
580 |
Dam Height |
24 |
River Or Stream |
TR-LOST CREEK |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
24 |
Drainage Area |
240 |
Nid Storage |
120 |
Structural Height |
24 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
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.
Grindstone-Lost-Muddy Watershed Dam C-75