John Speck Dam Reservoir Report
Nearby: Clapham Ca-29 Dam Charles Pollock Dam
Last Updated: December 19, 2025
John Speck Dam, located in Grundy, Missouri, is a privately owned earth dam designed by the USDA NRCS and completed in 2000 for grade stabilization along the TR-MUDDY river.
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Summary
Standing at 28 feet tall with a length of 275 feet, the dam has a storage capacity of 25 acre-feet and serves as a crucial structure for flood control and water management in the area. Despite being unregulated by the state, the dam's low hazard potential and moderate risk assessment make it a key component in the region's water resource infrastructure.
With a spillway width of 10 feet and a maximum discharge of 33 cubic feet per second, the John Speck Dam plays a vital role in managing water levels and preventing potential flooding in the surrounding area. While it lacks outlet gates and associated structures, the dam's construction and design by the Natural Resources Conservation Service reflect a commitment to sustainable water resource management practices. The dam's location in a rural setting further underscores its importance in protecting local communities and ecosystems from the impacts of extreme weather events and climate variability.
As a Grade Stabilization dam with a stone core and soil foundation, John Speck Dam exemplifies the intersection of engineering innovation and environmental conservation in water resource management. Its critical role in maintaining water quality, controlling sediment runoff, and mitigating flood risks underscores the importance of investing in sustainable infrastructure to address the challenges posed by a changing climate. With a focus on risk management and emergency preparedness, the dam stands as a testament to the ongoing efforts to safeguard our water resources for future generations.
Year Completed |
2000 |
Dam Length |
275 |
Dam Height |
27 |
River Or Stream |
TR-MUDDY |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
26 |
Drainage Area |
25.6 |
Nid Storage |
25 |
Structural Height |
28 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Thompson River At Trenton
|
111cfs |
Medicine Creek Near Laredo
|
6cfs |
East Fork Big Creek Near Bethany
|
2cfs |
Locust Creek Near Linneus
|
35cfs |
Grand River Near Gallatin
|
61cfs |
Grand River At Chillicothe
|
361cfs |
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.
John Speck Dam