Grassy Creek Watershed Dam G- 83 Reservoir Report
Last Updated: December 5, 2025
Grassy Creek Watershed Dam G-83, located in Lewis County, Missouri, was completed in 1990 by the USDA NRCS with a primary purpose of flood risk reduction.
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Summary
This earth dam stands at a height of 22 feet, with a structural height of 30 feet and a length of 411 feet. It has a maximum storage capacity of 78 acre-feet and serves a drainage area of 2828.8 acres, with a normal storage capacity of 21 acre-feet.
The dam, situated on the Little Grassy River, features an uncontrolled spillway with a width of 30 feet. Despite being classified as having a low hazard potential and not currently rated for condition assessment, the dam serves as a crucial structure for flood risk mitigation in the area. With a moderate risk assessment score of 3, it is important for local government officials in Ewing to ensure regular inspections and maintenance to uphold the safety and effectiveness of this vital water resource infrastructure.
Overall, Grassy Creek Watershed Dam G-83 plays a significant role in protecting the surrounding community from potential flood events, highlighting the importance of sustainable water resource management and climate resilience efforts. As a key component in the local flood risk reduction system, this dam serves as a reminder of the critical role that such infrastructure plays in safeguarding communities and ecosystems from the impacts of extreme weather events.
Year Completed |
1990 |
Dam Length |
411 |
Dam Height |
22 |
River Or Stream |
LITTLE GRASSY |
Primary Dam Type |
Earth |
Surface Area |
54 |
Hydraulic Height |
22 |
Drainage Area |
2828.8 |
Nid Storage |
78 |
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 |
Salt River Near Shelbina
|
30cfs |
Bear Creek Near Marcelline
|
5cfs |
Salt River At Hagers Grove
|
1cfs |
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- 83