Grassy Creek Watershed Dam G- 65 Reservoir Report
Last Updated: December 6, 2025
Grassy Creek Watershed Dam G-65, located in Lewis County, Missouri, was completed in 1990 by the USDA NRCS for the primary purpose of flood risk reduction along Grassy Creek.
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Summary
This earth dam stands at a height of 27 feet with a structural height of 30 feet and a length of 409 feet, providing a maximum storage capacity of 141 acre-feet and serving a drainage area of 275.2 square miles. With a spillway width of 30 feet and a low hazard potential, this dam plays a crucial role in mitigating flood risks in the region.
The dam's associated structures include stone core types and soil foundations, with a spillway type of uncontrolled. Despite being state-regulated, Grassy Creek Watershed Dam G-65 has not undergone state inspection, enforcement, or permitting. The dam's moderate risk assessment and emergency preparedness status indicate a need for continued monitoring and management to ensure its effectiveness in flood risk reduction and the protection of surrounding communities. Overall, this dam serves as a vital infrastructure for water resource management in the area.
Grassy Creek Watershed Dam G-65, managed by the local government of Ewing, Missouri, is a key asset in the area's water resource infrastructure. With its focus on flood risk reduction and multiple purposes such as fire protection and fish and wildlife habitat, this dam stands as a testament to the importance of sustainable water management practices. As climate change continues to impact water resources, the maintenance and upkeep of structures like Dam G-65 will be crucial in safeguarding communities and ecosystems in the Grassy Creek watershed for years to come.
Year Completed |
1990 |
Dam Length |
409 |
Dam Height |
27 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Hydraulic Height |
27 |
Drainage Area |
275.2 |
Nid Storage |
141 |
Structural Height |
30 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wyaconda River Above Canton
|
13cfs |
South Fabius River Near Taylor
|
12cfs |
North River At Palmyra
|
21cfs |
Bear Creek Near Marcelline
|
5cfs |
Salt River Near Shelbina
|
30cfs |
Fox River At Wayland
|
8cfs |
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- 65