Lake Jacomo Dam Reservoir Report

Last Updated: December 8, 2025

Lake Jacomo Dam, located in Lees Summit, Missouri, is a vital earth dam constructed in 1956 by the renowned engineering firm Black and Veatch.


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Summary

The dam serves primarily for recreation purposes and holds a maximum storage capacity of 38,620 acre-feet, with a normal storage of 25,730 acre-feet. The dam spans 1,550 feet in length and stands at a height of 74 feet, overseeing the East Fork Little Blue River.

Managed by the local government and regulated by the DAM AND RESERVOIR SAFETY PROG, Lake Jacomo Dam poses a high hazard potential due to its critical role in flood control and water supply management. Despite this, the dam is reported to be in satisfactory condition as of the last assessment in 2007, with regular inspections conducted every two years to ensure its structural integrity. While the risk assessment categorizes the dam as moderate, measures have been implemented to mitigate any potential risks and ensure the safety of the surrounding community.

With a surface area of 1,221 acres and a drainage area of 16,750 acres, Lake Jacomo Dam stands as a testament to effective water resource management and climate resilience efforts in Missouri. As a popular recreational spot, the dam not only provides essential benefits for flood protection and water supply but also offers a serene environment for outdoor enthusiasts to enjoy nature's beauty while appreciating the engineering marvel that is Lake Jacomo Dam.

Year Completed

1956

Dam Length

1550

Dam Height

74

River Or Stream

EAST FORK LITTLE BLUE RIVER.

Primary Dam Type

Earth

Surface Area

1221

Drainage Area

16750

Nid Storage

38620

Structural Height

74

Outlet Gates

Valve

Hazard Potential

High

Foundations

Rock

Nid Height

74
       
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.