Grindstone-Lost-Muddy Watershed Dam A-10b Reservoir Report

Last Updated: April 30, 2026

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Discover the hidden gem of the Grindstone-Lost-Muddy Watershed Dam A-10b, nestled in the picturesque Owens Creek in DeKalb, Missouri.


Summary

Constructed in 1987 by the USDA NRCS, this earth-type dam stands proudly at a height of 34.9 feet, with a capacity to store 640 acre-feet of water for flood risk reduction. The dam spans 750 feet and covers a surface area of 5 acres, serving as a vital resource for the local community of PATTONSBURG.

With a low hazard potential and moderate risk assessment, the Grindstone-Lost-Muddy Watershed Dam A-10b is a testament to effective water resource management. Despite not being state-regulated, the dam's uncontrolled spillway with a width of 80 feet ensures efficient water discharge during peak times. With a primary purpose of flood risk reduction, this dam plays a crucial role in safeguarding the surrounding area from potential disasters, showcasing the importance of sustainable infrastructure in mitigating the impacts of climate change on water resources.

15-Day Long Term Forecast


Year Completed

1987

Dam Length

750

Dam Height

34.9

River Or Stream

OWENS CREEK

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

34

Drainage Area

102.4

Nid Storage

640

Structural Height

34

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

35
       
Seasonal Comparison

5-Day Hourly Forecast Detail

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.
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