Grassy Creek Watershed Dam G- 76 Reservoir Report
Last Updated: December 19, 2025
Grassy Creek Watershed Dam G-76, located in Lewis County, Missouri, was completed in 1993 by the USDA NRCS for flood risk reduction along the Grassy Creek.
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Summary
This earth-type dam stands at a height of 26 feet, with a hydraulic height of 25 feet and a structural height of 32 feet, providing storage for 59 acre-feet of water. With a normal storage capacity of 16 acre-feet and a drainage area of 153.6 square miles, the dam plays a crucial role in mitigating flood risks in the area.
Despite its low hazard potential, this dam has a moderate risk assessment rating of 3, highlighting the importance of regular inspections and monitoring. The dam features an uncontrolled spillway with a width of 20 feet and has not been modified since its completion. Although it is not regulated or inspected by the state, the dam serves multiple purposes including fire protection, wildlife habitat enhancement, and flood risk reduction. With its location in a region prone to extreme weather events, the maintenance and upkeep of Grassy Creek Watershed Dam G-76 are essential for ensuring the safety and well-being of the surrounding communities and ecosystems.
Owned and operated by the local government, Grassy Creek Watershed Dam G-76 stands as a vital infrastructure for water resource management in the region. With its stone core and soil foundation, the dam spans 430 feet in length and covers a surface area of 4 acres. While its condition assessment is currently not rated, the dam's emergency action plan and risk management measures play a crucial role in maintaining its integrity and safeguarding against potential hazards. As a key component in the watershed's flood control system, the dam serves as a testament to the importance of sustainable water resource management in the face of changing climates and increasing water-related risks.
Year Completed |
1993 |
Dam Length |
430 |
Dam Height |
26 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
25 |
Drainage Area |
153.6 |
Nid Storage |
59 |
Structural Height |
32 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Fabius River Near Taylor
|
12cfs |
North River At Palmyra
|
15cfs |
Wyaconda River Above Canton
|
13cfs |
Bear Creek Near Marcelline
|
5cfs |
Bear Creek At Hannibal
|
2cfs |
Salt River Near Shelbina
|
16cfs |
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.
Grassy Creek Watershed Dam G- 76