Minckler Dam B Reservoir Report

Last Updated: December 13, 2025

Minckler Dam B, located in Island County, Washington, was completed in 1975 and serves primarily for recreational purposes.


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Summary

The dam, constructed as an earth type with a stone core and sitting on a soil foundation, has a hydraulic height of 25 feet and a length of 500 feet. This structure, situated on an unnamed tributary of Cresent Harbor, has a drainage area of 0.08 square miles and a storage capacity of 28 acre-feet.

With a hazard potential rated as "High" and a condition assessment of "Fair," Minckler Dam B is regulated and inspected by the Washington Department of Ecology. The dam has a normal storage capacity of 24 acre-feet and a maximum discharge of 9 cubic feet per second. Despite its recreational primary purpose, the dam's emergency action plan (EAP) status and risk management measures are currently unspecified, highlighting the potential need for enhanced safety protocols and disaster preparedness in the event of a breach or failure.

As a critical infrastructure in the region, Minckler Dam B falls under the jurisdiction of the Seattle District of the US Army Corps of Engineers and is represented by Congressman Rick Larsen. With its strategic location and significant impact on the surrounding environment, water resource and climate enthusiasts are urged to monitor updates on the dam's condition, inspection reports, and emergency response plans to ensure the safety and preservation of this vital water resource.

Year Completed

1975

Dam Length

500

River Or Stream

Unnamed Trib - Cresent Harbor

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

25

Drainage Area

0.08

Nid Storage

28

Structural Height

25

Hazard Potential

High

Foundations

Soil

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.