Planning and Research, Office of
(Office of Planning and Research)
Blackrock Hatchery Diversion/Siphon
NOE - Notice of Exemption
NOTE: California Department of Fish and Game is acting as Responsible Agency.
SAA #1600-2010-0032-R6 The proposed project is to conduct repairs on the forebay of Big Blackrock Spring near the Los Angeles Aqueduct (LAA). Permittee proposes to replace three deteriorated wooden gates with waterman sluice gates made of cast iron and to repair the undermined concrete headwalls as well as to line the forebay with concrete. Permittee shall install temporary coffer dams. A 42" bypass pipe will then be installed approximately 8' deep upstream of the measuring structure to divert and maintain flows into the LAA. Work is expected to begin in early January and will take up to 90 days to complete.