Grindstone-Lost-Muddy Watershed Dam F- 20 Reservoir Report
Last Updated: December 19, 2025
Located in Daviess County, Missouri, the Grindstone-Lost-Muddy Watershed Dam F- 20 is a vital structure designed for grade stabilization along the TR-GRINDSTONE CREEK.
°F
°F
mph
Wind
%
Humidity
Summary
Constructed in 1975 by the USDA NRCS, this earth dam stands at a height of 28 feet and spans a length of 650 feet, with a storage capacity of 103 acre-feet. The primary purpose of this dam is to prevent erosion and manage water flow in the area, with a low hazard potential and moderate risk assessment rating.
With a maximum discharge of 300 cubic feet per second, the dam features an uncontrolled spillway with a width of 40 feet. Despite not being state-regulated or inspected since 1980, the Grindstone-Lost-Muddy Watershed Dam F- 20 remains in good condition and has not been rated for its current state. While it does not have an Emergency Action Plan prepared, the dam continues to serve its intended purpose effectively, providing essential grade stabilization for the surrounding area.
Year Completed |
1975 |
Dam Length |
650 |
Dam Height |
28 |
River Or Stream |
TR-GRINDSTONE CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
28 |
Drainage Area |
216 |
Nid Storage |
103 |
Structural Height |
28 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
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 F- 20