Butterworth Dam, located in Pierce County, Washington, was completed in 1949 and serves primarily for irrigation purposes along the Eden Creek. This earth dam has a hydraulic height of 61 feet and a structural height of 51 feet, with a storage capacity of 2450 acre-feet. While its surface area covers 70 acres, the dam is associated with a drainage area of 1.3 square miles, ensuring a maximum discharge capacity of 25 cubic feet per second.

Despite its significant hazard potential, the condition assessment of Butterworth Dam is marked as poor, with the last inspection conducted in December 2015. The dam is regulated by the Washington Department of Ecology and is subject to state permitting, inspection, and enforcement. With its vital role in irrigation and water supply, Butterworth Dam stands as a crucial infrastructure in the region, highlighting the importance of ongoing maintenance and risk management measures to ensure its safety and effectiveness for the community.