The Combie and Ophir II & III 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,

Notice of Determination and Board of Directors Approval of the Combie-Ophir II & III Siphon Replacement Project and the Mitigation, Monitoring, and Reporting Plan

Combie-Ophir II & III Siphon Replacement Project Final Mitigated Negative Declaration and Initial Study with Appendices

Draft Initial Study and Mitigated Negative Declaration for the Nevada Irrigation District Combie-Ophir II& III Siphon Replacement Project

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

The District will consider adoption of a Mitigated Negative Declaration and Initial Study starting at 9:00 A.M. on June 26, 2024.  Input may be provided at the public hearing via Zoom or in person at the District's main office located at 1036 W. Main Street, Grass Valley, CA  95945.  Details for joining the meeting via Zoom will be available on the Board Agenda for the June 26, 2024, meeting on the District's website

Location Maps:
Orr Creek Siphon

Dry Creek Siphon

Rock Creek Siphon