Klonaqua Lake Dam Reservoir Report

Last Updated: December 15, 2025

Klonaqua Lake Dam, located in Leavenworth, Washington, was completed in 1933 and is owned by a public utility.


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Summary

The dam serves primarily for irrigation purposes, with additional benefits for recreation. It is a rockfill dam standing at a hydraulic height of 35.1 feet and a structural height of 19.3 feet, with a normal storage capacity of 1171.7 acre-feet and a maximum storage of 1223 acre-feet. The dam is situated on Tr-French Creek and falls under the regulatory oversight of the Washington Dept of Ecology, ensuring its compliance with state regulations and permitting requirements.

Despite its historical significance and vital role in water resource management, Klonaqua Lake Dam poses a high hazard potential and has been assessed as being in poor condition. The last inspection in August 2018 revealed the need for improvements to enhance the dam's safety and stability. The emergency action plan (EAP) for the dam was last updated in June 2021, indicating ongoing efforts to address potential risks and ensure preparedness for emergencies. With a drainage area of 0.77 square miles and a surface area of 62 acres, the dam's significance extends beyond irrigation to include environmental and recreational considerations.

As a key structure in the region's water infrastructure, Klonaqua Lake Dam plays a crucial role in water supply management and agricultural activities. Its association with Tr-French Creek and its location within the scenic landscape of Chelan County, Washington, make it a focal point for water resource and climate enthusiasts. The dam's historical legacy, combined with its current operational challenges and the need for maintenance and risk management measures, highlight the complex interplay between human development and environmental stewardship in the context of water resource management.

Year Completed

1933

Dam Length

130

River Or Stream

Tr-French Creek

Primary Dam Type

Rockfill

Surface Area

62

Hydraulic Height

35.1

Drainage Area

0.77

Nid Storage

1223

Structural Height

19.3

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

35
       
Seasonal Comparison

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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.