Deerwood Lake No.3 Dam Reservoir Report

Last Updated: December 7, 2025

Deerwood Lake No.3 Dam, located in Cedar Hill, Missouri, was completed in 1960 with a primary purpose of recreation.


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Summary

This private earth dam stands at a height of 25 feet and has a storage capacity of 40 acre-feet, making it a crucial water resource in the area. The dam overlooks the TRIB-ISOM CREEK and serves as a recreational hotspot for water enthusiasts in the region.

Despite its importance, Deerwood Lake No.3 Dam has a high hazard potential, as indicated in the data. The dam has not been inspected since 1980 and is currently rated as "Not Rated" in terms of condition assessment. With no emergency action plan in place and limited risk management measures identified, there is a need for increased monitoring and maintenance to ensure the safety and integrity of this essential water structure.

As climate change continues to impact water resources, it is crucial for authorities to prioritize the inspection and maintenance of dams like Deerwood Lake No.3 Dam. Given its significance for recreation and water storage, investing in risk management measures and emergency preparedness can help mitigate potential hazards and ensure the long-term sustainability of this vital water resource in Jefferson County, Missouri.

Year Completed

1960

Dam Height

25

River Or Stream

TRIB-ISOM CREEK

Primary Dam Type

Earth

Surface Area

3

Drainage Area

16

Nid Storage

40

Structural Height

25

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

25
       
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.