Zosel Dam, also known as the Osoyoos Lake Control Dam, is a gravity dam located within the city limits of Oroville in Washington. Completed in 1986, this state-regulated structure on the Okanogan River serves primarily for irrigation purposes, with additional benefits for recreation. The dam stands at a hydraulic height of 16 feet and a structural height of 12 feet, with a length of 366 feet and a capacity to store up to 300,000 acre-feet of water.

With a hazard potential rated as high, Zosel Dam has been assessed to be in satisfactory condition as of the last inspection in 2019. The Washington Department of Ecology oversees the regulation, inspection, and enforcement of this vital water resource infrastructure. Despite its age, the dam continues to provide essential water supply for the region, covering a surface area of 5800 acres and benefiting from a drainage area of 3150 acres. The dam's maximum discharge capacity reaches 18,225 cubic feet per second, ensuring efficient water management for downstream users.