Grassy Creek Watershed Dam G- 93 Reservoir Report
Last Updated: December 19, 2025
Grassy Creek Watershed Dam G-93, located in Durham, Missouri, was designed by the USDA NRCS and completed in 1994 for the primary purpose of flood risk reduction.
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Summary
This earth dam stands at a height of 25.3 feet and has a structural height of 34 feet, with a maximum storage capacity of 65 acre-feet and a normal storage capacity of 18 acre-feet. The dam spans 360 feet in length and covers a surface area of 8 acres, serving a drainage area of 260 acres along the Grassy Creek.
Despite being classified with a low hazard potential, this dam has a moderate risk assessment score of 3, indicating a need for cautious monitoring and management. The dam features an uncontrolled spillway with a width of 20 feet and is not subject to state regulations or inspections. While the condition of the dam is currently not rated, it is associated with various purposes such as fire protection, stock or small fish ponds, and fish and wildlife habitats. With its relatively low risk potential and strategic location for flood risk reduction, Grassy Creek Watershed Dam G-93 presents an important asset in the management of water resources in Marion, Missouri.
Year Completed |
1994 |
Dam Length |
360 |
Dam Height |
25.3 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Hydraulic Height |
25 |
Drainage Area |
260 |
Nid Storage |
65 |
Structural Height |
34 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Fabius River Near Taylor
|
12cfs |
North River At Palmyra
|
15cfs |
Wyaconda River Above Canton
|
13cfs |
Bear Creek Near Marcelline
|
5cfs |
Bear Creek At Hannibal
|
2cfs |
Salt River Near Shelbina
|
16cfs |
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- 93