Grindstone-Lost-Muddy Watershed Dam C-27 Reservoir Report
Last Updated: December 6, 2025
Grindstone-Lost-Muddy Watershed Dam C-27, located in Pattonsbury, Missouri, is a vital structure designed by the USDA NRCS for grade stabilization.
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Summary
Completed in 1975, this earth dam stands at a height of 22 feet and serves the primary purpose of preventing erosion in the TR-LOST CREEK stream. With a storage capacity of 109 acre-feet and a surface area of 12 acres, it plays a crucial role in managing water resources and protecting the surrounding area from potential hazards.
Despite being classified as having a low hazard potential, the dam is considered to have a moderate risk level, indicating the importance of ongoing monitoring and maintenance. The structure features an uncontrolled spillway with a width of 40 feet, ensuring efficient water discharge during high flow events. While it has not been inspected recently and is currently not rated for condition assessment, it remains a key component of the local water management infrastructure in Gentry County, Missouri.
As climate change continues to impact water resources, structures like Grindstone-Lost-Muddy Watershed Dam C-27 play a crucial role in mitigating the effects of extreme weather events and ensuring the resilience of the surrounding ecosystem. With its history of service and strategic location within the Rock Island District, this dam stands as a testament to the collaborative efforts of local government and federal agencies in safeguarding water quality and promoting sustainable water management practices.
Year Completed |
1975 |
Dam Length |
500 |
Dam Height |
22 |
River Or Stream |
TR-LOST CREEK |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
22 |
Drainage Area |
250 |
Nid Storage |
109 |
Structural Height |
24 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
One Hundred And Two River At Maryville
|
10cfs |
East Fork Big Creek Near Bethany
|
4cfs |
Platte River Near Agency
|
78cfs |
Missouri River At St. Joseph
|
23700cfs |
Grand River Near Gallatin
|
63cfs |
Nodaway River Near Graham
|
134cfs |
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-27