Zosel Dam, Gravity dam in Okanogan County, United States
Zosel Dam is a concrete gravity structure that spans the Okanogan River and regulates water levels in Osoyoos Lake through adjustable gates and spillway systems. The facility controls water flow throughout the year, supporting irrigation networks and maintaining stable lake levels for both farming and recreational use.
An original wooden structure built in 1927 for the Zosel Lumber Company served for log storage, then deteriorated over time until 1987 when engineers replaced it with the current concrete dam. This transition reflected changing engineering methods and the region's shift from timber handling to modern water management.
The dam reflects cooperation between the United States and Canada, as it operates under shared agreements to manage water that flows across borders. Both countries have a stake in how the facility manages the river's flow and the lake's water levels.
The dam is located in a rural area best reached by regional roads through Okanogan County. Visitors should plan visits during warmer months when roads and access conditions are most favorable for viewing the structure and surrounding landscape.
A major renovation project in 2024 upgraded the spillway gates and electrical systems while keeping the dam operational throughout construction work. This simultaneous modernization while maintaining function showcases advanced engineering approaches to facility upgrades.
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