Clark Lake is a private-owned body of water located in Wheeler County, Oregon, near Service Creek. This recreational lake was completed in 1971 and serves as a popular spot for water enthusiasts to enjoy activities such as fishing, boating, and swimming. With a surface area of 5700 square feet and a maximum storage capacity of 89 acre-feet, Clark Lake provides ample space for outdoor recreation while also serving important purposes such as irrigation and wildlife habitat.

The earth dam that forms Clark Lake stands at a height of 15 feet, with a hydraulic height of 12 feet, making it a reliable structure for water management in the area. The lake is regulated and inspected by the Oregon Water Resources Department, ensuring that it meets safety standards and remains a low hazard potential for the surrounding community. Despite not being rated for condition assessment, the lake's risk assessment is moderate, indicating the need for ongoing monitoring and management measures to maintain its integrity and functionality.

Clark Lake's spillway type is uncontrolled, with a slide (sluice gate) serving as the outlet gates for water release. With a drainage area of 9.3 square miles and a maximum discharge capacity of 67 cubic feet per second, the lake plays a crucial role in managing water flow in the region. Overall, Clark Lake is a valuable resource for both recreational and water management purposes, contributing to the natural beauty and sustainability of Wheeler County, Oregon.