Grassy Creek Watershed Dam G- 99 Reservoir Report
Last Updated: December 19, 2025
Grassy Creek Watershed Dam G-99, located in Marion, Missouri, was completed in 1996 with a 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 27 feet and has a storage capacity of 69 acre-feet. Serving multiple purposes such as fire protection, stock or small fish pond, fish and wildlife habitat, as well as flood risk reduction, this dam plays a crucial role in managing water resources in the area.
With a low hazard potential and a moderate risk assessment rating, Grassy Creek Watershed Dam G-99 contributes to the overall water management strategy in the region. Despite not being state regulated, inspected, or permitted, this dam provides essential flood protection to the surrounding area. The dam's uncontrolled spillway type and location on Grassy Creek further highlight its significance in managing water flow and reducing flood risks. For water resource and climate enthusiasts, this dam serves as an important infrastructure piece in the local watershed, showcasing the collaborative efforts between government agencies and designers to address water management challenges in the area.
Year Completed |
1996 |
Dam Length |
455 |
Dam Height |
27 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
26 |
Drainage Area |
305 |
Nid Storage |
69 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
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 Center
|
63cfs |
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- 99