Grindstone-Lost-Muddy Watershed Dam B- 10 Reservoir Report
Last Updated: December 5, 2025
Grindstone-Lost-Muddy Watershed Dam B-10, also known as Site B-10, is a local government-owned earth dam located in Gallatin, Missouri.
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Summary
Designed by USDA NRCS, this dam serves the primary purpose of flood risk reduction along the Grand River. Completed in 1992, it stands at a height of 29.2 feet and has a structural height of 36 feet, with a length of 700 feet and a storage capacity of 599 acre-feet.
With a low hazard potential and a moderate risk assessment rating, this dam has not been inspected since July 1993 and is currently in a condition that has not been assessed. Despite being unregulated by the state and lacking state permitting, inspection, and enforcement, the dam has a spillway width of 60 feet for uncontrolled spillage. The surrounding area of the dam covers a surface area of 3 acres and drains a total area of 25.6 square miles.
Climate and water resource enthusiasts will find Grindstone-Lost-Muddy Watershed Dam B-10 an intriguing infrastructure for flood risk management along the Grand River in Missouri. Its construction, design, and purpose showcase the efforts made to mitigate potential flooding incidents in the region, highlighting the importance of such structures in maintaining water resource sustainability and resilience in the face of changing climate conditions.
Year Completed |
1992 |
Dam Length |
700 |
Dam Height |
29.2 |
River Or Stream |
GRAND RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
26 |
Drainage Area |
25.6 |
Nid Storage |
599 |
Structural Height |
36 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
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- 10