Zosel Dam
Zosel Dam Repair Current Status
Phase Three – approved designs are being used for the contractual bidding process.
Sealed bids will be accepted for the following project: 2024-175 G (1-1), Zosel Dam Improvements.
Submit no later than 1:00 PM, July 31th, 2024.
Submit your bid online at DES Public Procurement Portal Bonfire
Current conditions
As of September 4 , the Osoyoos Lake level has fluctuated over the past few weeks as additional water has been released in configuring Zosel dam for efficient fish passage and the water being replenished by upstream dams. An estimated 200+ thousand sockeye salmon have passed upstream of the dam since mid-August. Now that most of the returning sockeye salmon have passed the dam the flow into Osoyoos Lake from upstream dams is being reduced and we will be configuring the dam for a more restricted flow.
The water levels will continue to fluctuate over the next week as flow are balanced. Ultimately the water levels in Osoyoos Lake will begin dropping to meet irrigation needs downstream of Zosel dam. We will continue to strive to keep lake levels within the International Joint Commission (IJC) mandated rule curve and meet the demands of instream flows.
You can track lake levels in real time, and find other information about the project by visiting the USGS web page for Osoyoos Lake.
Zosel Dam near Oroville, Washington. Photo by Chad Mathews
2023-25 Biennium Capital Project
In 2020, we contracted an engineering assessment to determine the current state of the sluice gates, structure, and other elements of the dam. To eliminate deficiencies in the structure, this assessment recommended several projects at the facility.
This project will be broken down into four phases:
- Phase one: Design of repairs and upgrades
- Phase two: Approval of designs. All entities involved in the project will approve (International Joint Commission, Department of Ecology, Department of Enterprise Services, etc.)
- Phase three: Final, approved designs will be used for the contractual bidding process
- Final phase: Construction of the project
Based on the completed assessment, the following identified repair and maintenance projects for Zosel Dam are:
- Professional services & contingency – Includes engineering services to do the installation and a contingency for any unexpected issues with design and installation.
- Gates, hoists, & control systems – Install a new drum hoisting system, gate controls, electrical systems, video surveillance, and refurbish spillway gates. Certify operation and installation.
- Electrical system updates – Update lighting systems, address fall hazards, replace the generator, and provide updated operations and maintenance manuals (including training) for the newly renovated facility components.
Ecology requested $5,549,000 for needed repair of Zosel Dam in Okanogan County to ensure proper operation and long-term care and protection of this state-owned asset. The budget for this project was developed based on an engineering assessment and budget estimate, dated December 22, 2020.
The budget of $5.5 million was approved and a deadline of 2025 was set to finish the project. Costs include the required consultant, project management, and contingency funds calculated, and the associated agency staff costs to provide project oversight and management, technical assistance, and stakeholder coordination for the project.
History
Zosel dam was completed in 1987 to maintain Osoyoos Lake water levels, as determined by the International Joint Commission, a board made up of representatives from the U.S. and Canada. The lake is surrounded by summer homes and provides recreational opportunities and irrigation water on both sides of the Canadian and United States borders. Zosel Dam is a critical piece of state infrastructure, which we own and operate by under the authority of RCW 43.21A.450.
Related links
Contact information
Samantha Long, EIT
Dam Safety Office Manager
samantha.long@ecy.wa.gov
Office: 360-407-6603
Cell: 360-972-4426