Grassy Creek Watershed Dam G- 63 Reservoir Report
Last Updated: December 6, 2025
Grassy Creek Watershed Dam G-63, located in Ewing, Missouri, was completed in 1991 and is owned by the local government.
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Summary
Designed by USDA NRCS, this earth dam on the Little Grassy River serves primarily for flood risk reduction but also supports fire protection, stock, fish, and wildlife ponds. With a height of 23 feet and a length of 470 feet, the dam has a storage capacity of 199 acre-feet and a drainage area of 332.8 square miles.
The dam has a low hazard potential and has not been rated for its condition assessment. The spillway, with a width of 30 feet, is uncontrolled. Although the dam has not been inspected since September 1999, its risk assessment is moderate. With no outlet gates and no associated structures, the dam's emergency action plan status and risk management measures are unknown. Despite its lack of recent inspections, Grassy Creek Watershed Dam G-63 remains a critical infrastructure for flood protection in Lewis County, Missouri.
For water resource and climate enthusiasts, Grassy Creek Watershed Dam G-63 presents an intriguing case study of a local government-owned structure designed by the USDA NRCS for flood risk reduction. Its location on the Little Grassy River and its moderate risk assessment highlight the importance of maintaining and monitoring dams to ensure the safety of surrounding communities. With a storage capacity of 199 acre-feet and a drainage area of 332.8 square miles, this earth dam plays a vital role in protecting against potential flooding events in the area.
Year Completed |
1991 |
Dam Length |
470 |
Dam Height |
23 |
River Or Stream |
LITTLE GRASSY |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
22 |
Drainage Area |
332.8 |
Nid Storage |
199 |
Structural Height |
30 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Fabius River Near Taylor
|
12cfs |
Wyaconda River Above Canton
|
13cfs |
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- 63