W Grimm Reservoir Report
Nearby: Helmut Weber Dam Benson Lake Dam
Last Updated: December 8, 2025
W Grimm is a privately owned Earth type dam located in Gasconade, Missouri, on the TR Gasconade River.
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Summary
Built in 1960, this recreational dam stands at a height of 20 feet and has a storage capacity of 64 acre-feet. With a low hazard potential and a condition assessment that is not rated, W Grimm serves as a vital source for recreation in the area.
Managed by the St. Louis District of the US Army Corps of Engineers, W Grimm provides a serene environment for outdoor enthusiasts to enjoy activities such as fishing, boating, and picnicking. The dam's normal storage capacity of 13 acre-feet ensures a steady water supply for the surrounding area, while its location in Gasconade County adds to the scenic beauty of the region. Despite not being regulated or inspected by the state, the dam continues to fulfill its primary purpose of recreation for the community.
As climate change continues to impact water resources, dams like W Grimm play a crucial role in providing recreational opportunities and maintaining a healthy ecosystem. With its low hazard potential and unlisted foundations, W Grimm stands as a testament to sustainable water management practices in Missouri. As water resource and climate enthusiasts, it is important to appreciate the significance of dams like W Grimm in preserving our natural environment and supporting outdoor recreational activities for generations to come.
Year Completed |
1960 |
Dam Height |
20 |
River Or Stream |
TR GASCONADE RIVER |
Primary Dam Type |
Earth |
Surface Area |
6 |
Drainage Area |
40 |
Nid Storage |
64 |
Structural Height |
20 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Hermann
|
31200cfs |
Gasconade River Near Rich Fountain
|
960cfs |
Maries River At Westphalia
|
16cfs |
Bourbeuse River At Union
|
110cfs |
Bourbeuse River Near High Gate
|
1cfs |
Missouri River At Jefferson City
|
32600cfs |
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.
W Grimm