The Upper Tuolumne River Ecosystem Program: Draft O'Shaughnessy Dam Instream Flow Management Plan

Monday, April 14, 2014

Draft O'Shaughnessy Dam Instream Flow Management Plan

The draft O'Shaughnessy Dam Instream Flow Management Plan is available for download via links provided below. The plan is comprised of a main document (211 pp) and 13 technical appendices (619 pp). The main document is intended to provide a thorough description of proposed future instream flow releases for O'Shaughnessy Dam and a summary of analyses used to develop the plan. In-depth, discipline-specific technical descriptions of analytical methods and results are provided in the appendices document for more technical readers.

Main document (41 MB pdf)
Appendices (136 MB pdf)

About the Program

The Tuolumne River is located on the west slope of the Sierra Nevada in central California. With headwaters in Yosemite National Park, the Tuolumne flows westward 150 miles to its confluence with the San Joaquin River in California's Central Valley.

The Upper Tuolumne River Ecosystem Program (UTREP) is a collaborative, long-term, science-based river management program led by the San Francisco Public Utilities Commission (SFPUC).

The UTREP monitors river ecosystem conditions and develops recommendations for river management downstream of Hetch Hetchy Project facilities to support broad river ecosystem values, while maintaining water supply reliability for 2.6 million San Francisco Bay Area customers and providing clean hydropower for San Francisco municipal facilities.

Scientific collaborators include Yosemite National Park, the US Fish and Wildlife Service, Stanislaus National Forest, consultants, researchers, and academics.

STATUS: UTREP efforts are currently focused on technical review and revision of the O'Shaughnessy Dam Instream Flow Management Plan and routine annual monitoring.