Vortex Tube Rehabilitation Project NOD

2 Documents in Project


SCH Number
Lead Agency
Sonoma County Water Agency
Document Title
Vortex Tube Rehabilitation Project NOD
Document Type
NOD - Notice of Determination

Document Description
The Vortex Tube is part of the Santa Rosa Creek Diversion Structure, a concrete flood control facility constructed in 1963 as part of the Central Sonoma Watershed Project to reduce flooding in downtown Santa Rosa. A concrete culvert beneath Montgomery Drive, known as the Vortex Tube, regulates peak winter floods in Santa Rosa Creek. The Vortex Tube has been damaged by abrasion during high flows. The purpose of the Proposed Project is to extend the useful life of the Vortex Tube by restoring its structural integrity. The Proposed Project’s repair of the Vortex Tube would be implemented in two phases: 1) construct a permanent Bypass Pipe beneath Montgomery Drive to temporarily direct creek flows around the Vortex Tube, and 2) dewater and repair the damaged Vortex Tube. The Proposed Project would not change the function or expand the capacity of the Diversion Structure.

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

Phone : (707) 322-8176


Santa Rosa
Other Location Info
The project is located on Santa Rosa Creek where it flows beneath Montgomery Drive, approximately 4 miles east of downtown Santa Rosa and approximately 3/4 mile east of Spring Lake Regional Park in Sonoma County.

Notice of Determination

Approving Agency
Sonoma County Water Agency
Approving Agency Role
Lead Agency
Approved On
Final Environmental Document Available at
Sonoma County Water Agency, 404 Aviation Blvd, Santa Rosa, CA 95403


(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


Notice of Determination
Vortex NOD_Final ocr   PDF 516 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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