Grindstone-Lost-Muddy Watershed Dam C-39b Reservoir Report
Last Updated: December 6, 2025
Grindstone-Lost-Muddy Watershed Dam C-39b, located in DeKalb County, Missouri, stands as a critical infrastructure managed by the local government for grade stabilization along the TR-LOST CREEK.
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Summary
Built in 1975 by USDA NRCS, this earth dam with a stone core stands at a height of 20 feet and spans 500 feet in length, providing a storage capacity of 93 acre-feet to manage runoff from its 380-acre drainage area. Despite its low hazard potential and moderate risk assessment, the dam's condition remains unrated, with no recent inspections to assess its structural integrity.
This uncontrolled spillway dam plays a vital role in mitigating erosion and sedimentation within the watershed, helping to maintain water quality and regulate flow downstream. Although not regulated or inspected by state authorities, its primary purpose of grade stabilization underscores its importance in protecting local water resources and aquatic habitats. With a history of federal funding and oversight from the Natural Resources Conservation Service, Grindstone-Lost-Muddy Watershed Dam C-39b serves as a testament to collaborative efforts in sustainable water management within the region.
As climate and water resource enthusiasts continue to monitor and advocate for resilient infrastructure, Grindstone-Lost-Muddy Watershed Dam C-39b stands as a focal point for ongoing maintenance and risk management. With its strategic location in Pattonburg and close proximity to the Rock Island District, this dam serves as a symbol of environmental stewardship and community resilience in the face of evolving climate challenges. As stakeholders work towards ensuring the long-term sustainability of this essential structure, its role in safeguarding local ecosystems and water supplies remains paramount in the broader context of watershed management and climate adaptation efforts.
Year Completed |
1975 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
TR-LOST CREEK |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
20 |
Drainage Area |
380 |
Nid Storage |
93 |
Structural Height |
20 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
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-39b