Grindstone-Lost-Muddy Watershed Dam B- 21 Reservoir Report
Last Updated: December 5, 2025
Grindstone-Lost-Muddy Watershed Dam B-21, located in DeKalb County, Missouri, serves as a crucial structure for grade stabilization along TR-WEST FORK CREEK.
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Summary
Built in 1973 by the USDA NRCS, this earth dam stands at a height of 34 feet and spans 700 feet in length. With a storage capacity of 316 acre-feet, the dam plays a vital role in managing water resources in the region, particularly during times of high discharge.
Despite its importance, Grindstone-Lost-Muddy Watershed Dam B-21 has a high hazard potential and is currently not rated for its condition. The spillway, which is uncontrolled and 40 feet wide, helps to manage excess water flow during heavy rainfall events. While there are no outlet gates associated with the dam, it remains a critical piece of infrastructure for the local government in Pattonsburg. As climate change continues to impact water resources, the maintenance and assessment of structures like Dam B-21 become increasingly essential for ensuring the safety and resilience of communities in the area.
With a drainage area of 25.6 square miles and a moderate risk assessment score of 3, Grindstone-Lost-Muddy Watershed Dam B-21 represents a significant asset for water resource management in the region. As efforts to address climate change intensify, the importance of maintaining and improving infrastructure like this dam will only grow. As water resource and climate enthusiasts, it is crucial to monitor and support initiatives that promote the sustainability and resilience of structures like Dam B-21 to ensure the long-term health and safety of our communities and waterways in Missouri.
Year Completed |
1973 |
Dam Length |
700 |
Dam Height |
34 |
River Or Stream |
TR-WEST FORK CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
34 |
Drainage Area |
25.6 |
Nid Storage |
316 |
Structural Height |
34 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
34 |
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 B- 21