G-L-M Creek A-6 Reservoir Report
Last Updated: December 5, 2025
Located in DeKalb, Missouri, G-L-M Creek A-6, also known as Grindstone Lost Muddy Creek Site A-6, is a privately owned earth dam designed by USDA NRCS and completed in 1997.
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Summary
This dam, situated on Wheeler Creek, serves the primary purpose of flood risk reduction, with a storage capacity of 573 acre-feet and a normal storage of 478 acre-feet. The dam is 41 feet high and spans a length of 1100 feet, with a surface area of 35 acres and a drainage area of 3853 acres.
Managed by the DAM AND RESERVOIR SAFETY PROG in Missouri, G-L-M Creek A-6 has a low hazard potential and is rated as being in satisfactory condition as of the last assessment in 2007. The dam features an uncontrolled spillway with a width of 75 feet and outlet gates utilizing a slide (sluice gate) system. With a maximum discharge capacity of 212 cubic feet per second, the dam plays a crucial role in mitigating flood risks in the region and ensuring the safety of surrounding communities.
Although the dam has not undergone any modifications in recent years, it undergoes inspections every five years, with the last inspection conducted in January 2018. The overall risk assessment for G-L-M Creek A-6 is moderate, with a DSAC (Dam Safety Action Classification) of 3. With its strategic location and structural integrity, this dam stands as a vital infrastructure contributing to water resource management and climate resilience efforts in the area.
Year Completed |
1997 |
Dam Length |
1100 |
Dam Height |
41 |
River Or Stream |
WHEELER CREEK |
Primary Dam Type |
Earth |
Surface Area |
35 |
Drainage Area |
3853 |
Nid Storage |
573 |
Structural Height |
41 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
41 |
Seasonal Comparison
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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.
G-L-M Creek A-6