Grassy Creek Watershed Dam G- 29 Reservoir Report
Last Updated: December 11, 2025
Grassy Creek Watershed Dam G-29, located in Lewis, Missouri, was completed in 1998 with a primary purpose of flood risk reduction.
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Summary
This earth dam stands at a height of 23.6 feet, with a hydraulic height of 23 feet and a structural height of 37 feet. The dam has a storage capacity of 70 acre-feet, with a normal storage of 19 acre-feet and a drainage area of 108.8 square miles.
Managed by the local government and designed by USDA NRCS, this dam on Grassy Creek serves various purposes including fire protection, stock or small fish pond, fish and wildlife pond, in addition to flood risk reduction. With a hazard potential rated as low and a moderate risk assessment, the dam's condition is currently not rated. The dam features an uncontrolled spillway with a width of 20 feet and has no outlet gates. Although the dam has not been inspected since August 1999, its risk management measures and emergency action plan status remain undisclosed.
Overall, Grassy Creek Watershed Dam G-29 plays a crucial role in mitigating flood risks in the area, while also providing additional benefits for wildlife and water resource management. As a key structure in the region, it is essential for stakeholders to ensure timely inspections and maintenance to uphold its functionality and safety for the surrounding community.
Year Completed |
1998 |
Dam Length |
600 |
Dam Height |
23.6 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
19 |
Hydraulic Height |
23 |
Drainage Area |
108.8 |
Nid Storage |
70 |
Structural Height |
37 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wyaconda River Above Canton
|
13cfs |
South Fabius River Near Taylor
|
12cfs |
North River At Palmyra
|
19cfs |
Fox River At Wayland
|
8cfs |
Salt River Near Shelbina
|
210cfs |
Bear Creek Near Marcelline
|
5cfs |
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- 29