Grassy Creek Watershed Dam G- 56 Reservoir Report
Last Updated: December 6, 2025
Grassy Creek Watershed Dam G-56, located in Ewing, Missouri, was completed in 1990 with the primary purpose of flood risk reduction.
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Summary
Managed by the local government and designed by USDA NRCS, this earth dam stands at a height of 32 feet and has a hydraulic height of 21 feet. With a storage capacity of 63 acre-feet and a drainage area of 211.2 square miles, the dam serves multiple purposes including fire protection, stock or small fish pond, fish and wildlife pond, and flood risk reduction.
This low hazard potential dam on Grassy Creek boasts a spillway width of 30 feet and a maximum discharge capacity of 168 cubic feet per second. Although not rated for condition assessment, the dam has been inspected periodically, with the last inspection conducted in September 1999. The risk assessment for this structure is moderate, with a DSAC assigned date and no documented emergency action plan currently in place. Despite its modest surface area of 7 acres, Grassy Creek Watershed Dam G-56 plays a crucial role in managing water resources in the Lewis County area.
Overall, Grassy Creek Watershed Dam G-56 is a vital asset for flood risk reduction in the region, designed and managed by USDA NRCS and local government entities. With its strategic location on Grassy Creek, this earth dam ensures the safety of surrounding communities and wildlife by providing essential storage and drainage capabilities. While the dam's condition assessment is pending, its low hazard potential and moderate risk assessment highlight the importance of continued monitoring and maintenance to uphold its functionality and resilience in the face of changing climate conditions.
Year Completed |
1990 |
Dam Length |
402 |
Dam Height |
21 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
21 |
Drainage Area |
211.2 |
Nid Storage |
63 |
Structural Height |
32 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
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- 56