Grindstone-Lost-Muddy Watershed Dam C- 60 Reservoir Report

Last Updated: December 6, 2025

Grindstone-Lost-Muddy Watershed Dam C-60, located in Pattonsburt, Missouri, is a crucial structure managed by the local government for grade stabilization purposes.


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Summary

Built in 1975 by the USDA NRCS, this earth dam stands at a height of 25 feet and has a storage capacity of 135 acre-feet. The dam spans 600 feet in length and is designed with a stone core and soil foundation, ensuring its structural integrity.

With a low hazard potential and moderate risk assessment rating, Grindstone-Lost-Muddy Watershed Dam C-60 plays a vital role in managing water flow and preventing erosion along TR-LOST CREEK. Although it is currently not rated for condition assessment, the dam provides essential flood control and water resource management services for the surrounding area. Despite not being regulated or inspected by the state, this dam serves as a critical infrastructure for the local community.

As a part of the Rock Island District, this dam is an integral component of the regional water management system. With a spillway width of 40 feet and a maximum discharge of 300 cubic feet per second, Grindstone-Lost-Muddy Watershed Dam C-60 is equipped to handle significant water flow during extreme weather events. Its uncontrolled spillway design and lack of outlet gates signify its reliance on natural processes for managing water levels, highlighting the importance of this structure in maintaining the ecological balance of the area.

Year Completed

1975

Dam Length

600

Dam Height

25

River Or Stream

TR-LOST CREEK

Primary Dam Type

Earth

Surface Area

17

Hydraulic Height

25

Drainage Area

330

Nid Storage

135

Structural Height

27

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

27
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.