Casad Dam Reservoir Report

Last Updated: December 15, 2025

Casad Dam, located in Belfair, Washington, is a vital structure owned by the local government and regulated by the Washington Department of Ecology.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1956, this arch-type dam on the Union River serves the primary purpose of supplying water to the region, with a storage capacity of 4,500 acre-feet and a maximum discharge of 520 cubic feet per second. Standing at a hydraulic height of 190 feet and a structural height of 130 feet, the dam spans 416 feet in length and covers a surface area of 40 acres.

Despite being classified as having a high hazard potential, Casad Dam is currently assessed to be in fair condition as of its last inspection in August 2018. The dam's Emergency Action Plan (EAP) status is unknown, and there is no record of the existence of inundation maps or risk assessments. With a history of state regulation and inspection, Casad Dam remains a critical water resource infrastructure in Kitsap County, Washington, ensuring a reliable water supply for the surrounding communities while being subject to ongoing monitoring and maintenance to ensure public safety and environmental protection.

Year Completed

1956

Dam Length

416

River Or Stream

Union River

Primary Dam Type

Arch

Surface Area

40

Hydraulic Height

190

Drainage Area

2.71

Nid Storage

4500

Structural Height

130

Hazard Potential

High

Foundations

Soil

Nid Height

190
       
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.