NID Hemphill Diversion Structure

5 Documents in Project


SCH Number
Lead Agency
Nevada Irrigation District
Document Title
NID Hemphill Diversion Structure
Document Type
NOD - Notice of Determination
Document Description
he structure diverts water from Auburn Ravine into the Hemphill Canal, located south of the ravine, for delivery to NID raw-water customers. The diversion structure is an approximately eight-foot-high concrete structure, with an approximately 40-foot-long concrete apron extending downstream. It has been operated by NID since its purchase in 1933. Hemphill Diversion has been subject to damage during high flow events, has required ongoing maintenance, and is currently in need of additional repairs. The diversion structure has historically presented a substantial impediment to the passage of migrating anadromous fish species that spawn in Auburn Ravine upstream of the diversion. NID considered three project alternatives to remove the diversion structure as an impediment to fish passage. The approved project, Alternative 2, will remove the diversion structure, stabilize the diversion site, construct a nature-like roughen rock ramp instream fish passage, install a fish screen, and implement improvements to a portion of the Hemphill Canal. The project is designed to allow anadromous fish to migrate past the Hemphill Diversion Structure site unimpeded.

Contact Information

Tonia M. Tabucchi Herrera
Agency Name
Contact Types
Lead/Public Agency


Grass Valley
Other Location Info
The Hemphill Diversion Structure spans Auburn Ravine in Placer County, just east of the City of Lincoln. The structure is located in Section 13, Township 12 North, and Range 6 West (Mount Diablo Base and Meridian) of the "Lincoln" 7.5-minute quadrangle. The coordinates are latitude 38.896731 ° and longitude -121.251885°

Notice of Determination

Approving Agency
Nevada Irrigation District
Approving Agency Role
Lead Agency
Approved On
County Clerk
Final Environmental Document Available at
Nevada Irrigation District 1036 West Main Street Grass Valley, CA 95945


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA


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