Cherry Dam Outlet Works
The outlet facilities at Cherry Dam have reached the end of their service life at nearly 60 years old. The stream release assets must be in working conditions to meet U.S. Department of Interior’s stream flow requirements, but requirements cannot be met at low lake elevations. The 66” valves were replaced in order to safely operate the dam during storm conditions and heavy inflows to Cherry Lake. The valves are critical for maintaining maximum carryover storage and meeting San Francisco Public Utility Commission’s water supply objectives. The scope of work includes replacement of the stream release valves and associated piping, as well as the Low Level Outlet 66” hollow jet valves. Additionally, the contract work will also repair two butterfly valves that serve as guard valves to the hollow jet valves. Construction is expected to conclude in May 2018.
O’Shaughnessy Dam Outlet Works
Valve installation for O’Shaughnessy Dam drum gate automation
The objective of the O’Shaughnessy Dam Outlet Works Project is to rehabilitate the drum gate and the release system from O’Shaughnessy Dam. The Outlet Works consists of six slide gates, seven needle valves, and a butterfly valve. These valves are due for upgrades due to age and to meet safety compliance.
The O’Shaughnessy Dam Outlet Works has been separated into several subprojects. The O’Shaughnessy Drum Gate Automation was the first and it completed in March 2017. The O’Shaughnessy Dam Outlet Works – Access & Drainage Improvements is the next subproject and it is in the Planning Phase