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Hemphill Diversion Structure Fish Passage Project

NEW Design and Technical Specifications added March 31, 2021.

NEW Additional Response to Comments - Roughen Rock Ramp Project Examples added April 7, 2022

Project Description:

The Hemphill Diversion Structure is located on Auburn Ravine northeast of the City of Lincoln in Placer County.  The structure diverts water from Auburn Ravine into the Hemphill Canal located south of the ravine for delivery to NID raw water customers.  The Hemphill Diversion Structure is an approximately 8-foot tall concrete structure that has been utilized, reconstructed, and maintained by the District since its purchase of the facility in 1933. 

Auburn Ravine is identified as a salmon and steelhead habitat and the Hemphill Diversion Structure has been identified as a barrier within Auburn Ravine.  With this Project's completion it will open up approximately 6 miles of habitat to migrating and resident fish.

The Project will remove the existing diversion structure and construct a roughen-rock ramp fish passage in its place to allow for fish passage.  Improvements to the Hemphill Canal will include a fish screen to prevent fish entrapment while maintaining water deliveries to NID raw water customers.  The 100% Design and Technical Specifications (Drafts) are now available for review, see the link below.

A Request for Quotes was sent to seven contractors who were prequalified to submit bids for the construction of the project.  Quotes must be submitted by May 4, 2022 at 3:00 P.M.  Construction is expected to begin in Spring, 2022.

The District is developing an agreement with the Placer Conservation Authority (PCA) to allow the District to participate in the program.  It is anticipated to be brought before the Board at the April 13, 2022, meeting for approval.  Staff is currently finalizing the application to submit for the 1602 Streambed Alteration Agreement and the Placer County Conservation Program Permits (PCCP).

The Hemphill Diversion Fish Passage Project was awarded a California Wildlife Conservation Board, Proposition 68 Grant of $1,500,000 on February 24, 2022.  The District thanks all  those who have shown support for this important fish passage restoration project.

To see documents related to the Design, Environmental Compliance, and other Project documentation, select from the links below:

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