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Hemphill Diversion Structure

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 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.  The District proposes to remove the Hemphill Diversion Structure within Auburn Ravine.

The District is considering implementing one of three Project alternatives. The alternatives would require the removal of the existing Hemphill Diversion Structure.  All are designed to allow for anadromous fish migration beyond the Hemphill Diversion Structure site.  The District has not yet identified a preferred alternative. The three alternatives are assessed in the Draft EIR document.

The public review and comment period for the Draft EIR will extend for 45 days starting April 1, 2021, and ending May 17, 2021.  Comments may be directed to Kris Stepanian at or mailed to the District office at 1036 W. Main Street, Grass Valley, CA  95945,   To view the Draft EIR, see the Project Documents section or click on the link below.


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