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Combie and Ophir 2 & 3 Siphon Replacement Project 

The Combie and Ophir 2 & 3 Siphon Replacement Project (Project) involves the replacement of three existing underground siphon pipelines.   The Orr Creek, Dry Creek, and Rock Creek siphons are each over fifty years old, are nearing the end of their useful life, and require resizing to address approved future flow needs.  The siphons are part of NID’s Combie and Ophir 2 & 3 raw water delivery system.  The first replacement will be the Orr Creek Siphon, which is currently under design and will be replaced in the fall of this year.    

Draft Initial Study and Mitigated Negative Declaration for the Nevada Irrigation District Combie and Ophir 2 & 3 Siphon Replacement Project

Notice of Intent to Adopt a Mitigated Negative Declaration and Initial Study

The District will hold a meeting with property owners potentially impacted by the project on April 24, 2024, at 6:00 PM at the District's main office located at 1036 W. Main Street, Grass Valley, CA  95945, in the Board Room and online via Zoom.  Click the link below to join the Zoom meeting:

Or Telephone:

         +1 669 900 6833

Webinar ID: 883 2771 2224

Or One tap mobile :


Location Maps:
Orr Creek Siphon

Dry Creek Siphon

Rock Creek Siphon

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