Vortex Tube Rehabilitation Project Draft Initial Study and Mitigated Negative Declaration of Environmental Impact

2 Documents in Project


SCH Number
Lead Agency
Sonoma County Water Agency
Document Title
Vortex Tube Rehabilitation Project Draft Initial Study and Mitigated Negative Declaration of Environmental Impact
Document Type
MND - Mitigated Negative Declaration

Document Description
The Sonoma County Water Agency (Sonoma Water) is the project proponent and lead agency in accordance with the California Environmental Quality Act (CEQA) for the proposed Vortex Tube Rehabilitation Project (Proposed Project), which is a flood control structure repair project. Sonoma Water staff has prepared this Draft Initial Study and Mitigated Negative Declaration of Environmental Impact (Draft IS/MND) to provide decision makers, the public, responsible agencies, and trustee agencies with information about the potential environmental impacts associated with the construction, maintenance, and operation of the Proposed Project. This Draft IS/MND was prepared pursuant to the requirements of CEQA (California Public Resources Code Sections 21000 et seq.), State CEQA Guidelines (Code of Regulations, Title 14, Division 6, Chapter 3), and Sonoma Water’s Procedures for the Implementation of CEQA. After completion of the public review period for this document, this Draft IS/MND, along with a summary of comments submitted and response, will be brought before Sonoma Water’s Board of Directors for their consideration. The Vortex Tube is part of the Santa Rosa Creek Diversion Structure flood control facility, located beneath Montgomery Drive, near Spring Lake and the City of Santa Rosa. The Vortex Tube has deteriorated from over a half-century of scour. The Proposed Project would restore the structural integrity of the Vortex Tube and facilitate future inspections and maintenance.

Contact Information
David Cook
Sonoma County Water Agency
Lead/Public Agency
Sonoma County Water Agency 404 Aviation Blvd
Santa Rosa, CA 95403

Phone : (707) 547-1944


Santa Rosa
Other Location Info
The Proposed Project is located along Santa Rosa Creek at Montgomery Drive approximately 4 miles east of downtown Santa Rosa and ¾ mile east of Spring Lake Regional Park. The Proposed Project would occur within the Santa Rosa Creek Diversion Structure, and within the natural creek channel immediately upstream and downstream of the Diversion Structure on both sides of Montgomery Drive. The Proposed Project is located on Sonoma Water-owned and managed land. Sonoma Water’s Stream Maintenance Program frequently conducts sediment removal and vegetation management activities in the Project area in order to maintain the flood control facility.

Notice of Completion

Review Period Start
Review Period End
Reviewing Agencies
California Air Resources Board (ARB) California Department of Conservation (DOC) California Department of Parks and Recreation California Department of Transportation, District 4 (DOT) California Department of Water Resources (DWR) California Highway Patrol (CHP) California Native American Heritage Commission (NAHC) California Natural Resources Agency California Regional Water Quality Control Board, North Coast Region 1 (RWQCB) Department of Toxic Substances Control Office of Historic Preservation State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Divison of Financial Assistance California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)


Environmental Document
Draft IS MND_Vortex Tube Rehabilitation Project_final   PDF 7540 K NOA, NOI_Vortex Tube Rehabilitation Project_final   PDF 98 K
NOC_Vortex Tube Rehabilitation Project_final   PDF 337 K
State Comments
2020080522_CDFW Comment   PDF 341 K

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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