Demarco Lake Dam Reservoir Report

Last Updated: December 6, 2025

Demarco Lake Dam, located in Boone County, Missouri, serves as a vital water resource for the community while also providing recreational opportunities.


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Summary

This private dam, standing at a height of 31 feet, has a storage capacity of 50 acre-feet and covers a surface area of 3 acres. Although it was last inspected in 1980 and carries a high hazard potential, its condition remains unrated, highlighting the need for further assessment and potential improvements to ensure its safety and longevity.

The primary purpose of Demarco Lake Dam is for recreation, with additional benefits including water supply. Despite being unregulated by the state, this earth dam with a buttress core plays a crucial role in managing water resources in the area. The dam's location near the TR-Missouri River and its proximity to the city of Claysville make it a significant asset for both residents and visitors, emphasizing the importance of maintaining and monitoring its structural integrity for the future.

As climate change continues to impact water resources, the significance of structures like Demarco Lake Dam becomes increasingly apparent. With a focus on risk assessment and management, as well as potential emergency action planning, it is essential to prioritize the safety and functionality of dams like Demarco Lake to ensure the sustainability of water supplies and recreational opportunities for generations to come.

Dam Height

31

River Or Stream

TR-MISSOURI RIVER

Primary Dam Type

Earth

Surface Area

3

Drainage Area

42

Nid Storage

50

Structural Height

31

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

31
       
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.