Lake Deanna Dam Reservoir Report

Last Updated: December 6, 2025

Lake Deanna Dam is a privately owned structure located in Cass, Missouri, along Harding Creek.


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Summary

Constructed in 2018 by designer HEAGLER, this buttress dam stands at a height of 67 feet and has a maximum storage capacity of 1876 acre-feet. The dam serves the purpose of flood control and water storage, with a normal storage capacity of 1199 acre-feet and a surface area of 59 acres.

With a significant hazard potential and a satisfactory condition assessment as of March 2018, Lake Deanna Dam is regulated by the Missouri Dam and Reservoir Safety Program. The dam features an uncontrolled spillway with a width of 40 feet and a maximum discharge capacity of 1098 cubic feet per second. Despite its moderate risk level, the dam has not been assigned a Dam Safety Action Classification (DSAC) date, and there are no emergency action plans in place as of the latest data update in May 2018.

Water resource and climate enthusiasts will be intrigued by the engineering and operational details of Lake Deanna Dam, including its foundations in rock and soil, as well as its proximity to the Tulsa District of the US Army Corps of Engineers. As a crucial component of water management in the region, the dam's role in protecting downstream areas and regulating water flow in Harding Creek showcases the importance of maintaining and monitoring such critical infrastructure for the community's safety and well-being.

Year Completed

2018

Dam Length

800

Dam Height

67

River Or Stream

HARDING CREEK

Surface Area

59

Hydraulic Height

61

Drainage Area

664

Nid Storage

1876

Structural Height

77

Outlet Gates

None

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

77
       
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.