Moccasin Creek Hatchery Permanent Recirculation Project

2 Documents in Project


SCH Number
Public Agency
California Department of Fish and Wildlife, Central Region 4 (CDFW)
Document Title
Moccasin Creek Hatchery Permanent Recirculation Project
Document Type
NOE - Notice of Exemption
Document Description
The San Francisco Public Utility Commission (SFPUC), a department of the City and County of San Francisco, operates the Hetch Hetchy Water and Power System, which provides water to the California Department of Fish and Wildlife’s (CDFW’s) Moccasin Creek Fish Hatchery (Hatchery) from Moccasin Reservoir. In 2016, an emergency recirculation system was constructed by CDFW at the Hatchery (funded by SFPUC), which allowed the Hatchery to continue operating with a smaller fish inventory and with only 3 cubic feet per second (cfs) of inflow from Moccasin Reservoir. This emergency recirculation system successfully operated during SFPUC’s January 3, 2017 to March 4, 2017 shutdown, which temporarily eliminated water deliveries through the Mountain Tunnel to accommodate necessary inspections and maintenance. As a result of inspections and work performed during the 2017 Shutdown, SFPUC determined it would require multiple 60- to 100-day shutdowns over a 6-year period to complete the rehabilitation of Mountain Tunnel. Adding on to what was constructed in 2016, CDFW will be constructing a reuse system (Permanent Recirculation System) at the Hatchery using funding provided by SFPUC. The Permanent Recirculation System will accommodate water supply interruptions for periods of 60 to 100 days. The Permanent Recirculation System generally consists of installation of: 1) permanent power with backup generator and transfer switch; 2) a new sump for existing pumps; 3) drum filtration; 4) a safe platform access for existing aeration towers; and 5) a fish exclusion screen at the existing settling pond.

Contact Information

Julie Vance
Agency Name
California Department of Fish and Wildlife Central Region
Contact Types
Lead/Public Agency


Other Location Info
Moccasin Creek Fish Hatchery

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Reasons for Exemption
The SFPUC maintenance project is necessary to maintain potable water delivery from the Hetch Hetchy Water System to the City and County of San Francisco. The Permanent Recirculation Project is necessary as a result of the overall SFPUC maintenance project but it was not specifically contemplated in the CEQA analysis conducted previously by SFPUC, as the Permanent Recirculation Project was not fully developed at the time of their CEQA analysis.


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