Located in Lyle, Washington, the Johnson Creek Reservoir Dam stands as a crucial structure for irrigation purposes since its completion in 1982. This private-owned dam, regulated by the Washington Dept of Ecology, holds a maximum storage capacity of 150 acre-feet and serves various functions including fire protection, stock, and small fish pond irrigation. With a hydraulic height of 18 feet and a structural height of 17 feet, the dam plays a vital role in managing the water resources of Johnson Creek.

Despite its importance, the Johnson Creek Reservoir Dam poses a high hazard potential and has been assessed to be in poor condition as of February 2017. Regular inspections are conducted every five years to ensure its safety and functionality. With a drainage area of 1.8 square miles and a maximum discharge capacity of 600 cubic feet per second, the dam plays a critical role in water management for the surrounding area, highlighting the need for ongoing maintenance and risk management measures to safeguard both the structure and the local community.