Ione Mill Pond Reservoir Report

Last Updated: December 13, 2025

Ione Mill Pond is a picturesque water resource located in Ione, Washington, along Big Muddy Creek.


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Summary

Built in 1914, this earth dam serves primarily for recreational purposes, offering a serene setting for outdoor activities such as fishing, boating, and wildlife observation. With a storage capacity of 557 acre-feet and a surface area of 37.2 acres, the pond provides a tranquil escape for visitors seeking to immerse themselves in nature.

Managed by the Washington Department of Ecology, Ione Mill Pond is regulated, inspected, and enforced to ensure its safety and environmental impact. The dam stands at a hydraulic height of 35 feet and a structural height of 21 feet, with a length of 1050 feet. While categorized as having a low hazard potential, the dam's condition is currently unrated. Despite this, the pond's serene setting and recreational opportunities make it a popular destination for water resource and climate enthusiasts in Pend Oreille County, Washington.

With its rich history dating back over a century, Ione Mill Pond continues to be a beloved destination for those seeking outdoor recreation and natural beauty in the Pacific Northwest. Its tranquil waters and surrounding wildlife offer a peaceful escape for visitors looking to connect with nature and enjoy the benefits of this man-made reservoir. As climate change continues to impact water resources, the management and conservation of places like Ione Mill Pond are crucial for maintaining the balance of ecosystems and providing sustainable recreational opportunities for future generations.

Year Completed

1914

Dam Length

1050

River Or Stream

Big Muddy Creek

Primary Dam Type

Earth

Surface Area

37.2

Hydraulic Height

35

Drainage Area

28.7

Nid Storage

557

Structural Height

21

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

35
       
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.