Dillon Lake Dam Reservoir Report
Nearby: Hayes Lake Dam Wensler Lake Dam
Last Updated: December 6, 2025
Dillon Lake Dam, located in Maries, Missouri, was completed in 1954 and serves primarily for recreation and water supply purposes.
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Summary
This private dam, with an earth and buttress core type, stands at a height of 25 feet and has a storage capacity of 160 acre-feet. The dam overlooks the TR TO PIN OAK BRANCH river or stream and covers a surface area of 12 acres within a drainage area of 60 square miles.
Despite its low hazard potential and not yet rated condition assessment, Dillon Lake Dam has not been subject to state regulation, inspection, or enforcement. The dam is under the jurisdiction of the Kansas City District of the US Army Corps of Engineers and is situated 2 miles away from the city of SAFE. While the dam has not undergone recent inspections or emergency action plan preparations, its presence highlights the importance of maintaining water resources for both recreational and practical purposes in the region.
Year Completed |
1954 |
Dam Height |
25 |
River Or Stream |
TR TO PIN OAK BRANCH |
Primary Dam Type |
Earth |
Surface Area |
12 |
Drainage Area |
60 |
Nid Storage |
160 |
Structural Height |
25 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bourbeuse River Near High Gate
|
2cfs |
Little Piney Creek At Newburg
|
82cfs |
Meramec River Near Steelville
|
244cfs |
Gasconade River At Jerome
|
944cfs |
Gasconade River Near Rich Fountain
|
1030cfs |
Meramec River At Cook Station
|
47cfs |
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.
Dillon Lake Dam