Summit Mills Dam Reservoir Report

Last Updated: December 8, 2025

Summit Mills Dam, located in Lee's Summit, Missouri, is a privately owned earth dam with a core type of buttress and a height of 21.6 feet.


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Summary

The dam, completed in an unspecified year, has a storage capacity of 28 acre-feet and covers a surface area of 3.24 acres. It is situated on a tributary of the East Fork Little River and falls under the jurisdiction of the Kansas City District of the US Army Corps of Engineers.

With a high hazard potential and a moderate risk assessment rating, Summit Mills Dam poses a significant threat in case of failure. Despite being in a not rated condition, the dam has not been inspected since May 2004. It lacks an Emergency Action Plan (EAP) and inundation maps, suggesting a need for improved risk management measures and preparedness for potential emergencies. As an important structure for water resource management in the area, there is a call for increased oversight and regular inspections to ensure the safety of the community and surrounding areas.

Dam Length

300

Dam Height

21.6

River Or Stream

TRIB. OF EAST FORK LITTLE RIV

Surface Area

3.24

Drainage Area

389.35

Nid Storage

28

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

22
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.