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Watershed Health

Flooding on Green Valley Road

Gold Ridge RCD has been working with the community to identify a solution to the chronic flooding of Green Valley Creek across Green Valley Road just outside Graton, CA. Local organizations have conducted and presented studies of the causes of flooding and potential short- and long-term solutions. Gold Ridge RCD will not be funding or managing flood mitigation projects; instead, it has played a role in facilitating the research and development of mitigation solutions.

Receive Updates:

If you would like to receive email updates regarding Green Valley Road flooding, use this link to email Sierra Cantor, and title the email subject: "Request for Updates on Green Valley Rd Flooding".

 

Latest Community Updates

March 10th Update: Green Valley Road has one lane open. Repairs on the other lane will start once the pavement has dried out.

March 10th Update: The creek excavation to restore capacity in Green Valley Creek went smoothly and was completed today. Green Valley Creek is flowing in the channel and no longer flowing across the road. County Department of Transportation and Public Works (DTPW) staff will be assessing the repairs needed on the road surface this afternoon (there is mud on the road currently and impact from the heavy equipment) and will make a determination about when the road can be re-opened to one-lane. Further repairs will need to be made to open to 2 lanes and we will let you know when we hear an update on that work.

Status of the road closure can be found at: http://roadconditions.sonoma-county.org/
We want to thank the Sonoma County Water Agency crews for all of their hard work, as well as express our gratitude to Maddocks Construction, Sanchietti Farming, Dutton Ranch and Bohan and Canelis for all of their help through this project. We will send out an update on the road repair schedule and any associated closures as soon as we have more information.

March 8th update: Work got underway in Green Valley Creek adjacent to Green Valley Road on Monday. Sonoma County Water Agency crews have been busy expanding the capacity of the stream channel. As soon as the excavation is complete, Green Valley Creek will be able to resume flowing into the channel. Once the stream is no longer flowing across the road, County Transportation and Public Works staff will be able to assess the repairs needed on the road surface. The goal is to open at least one lane of Green Valley Road as soon as possible and we’ll keep you updated as soon as we have more information on when this will occur.

Press Release Emergency Green Valley Road Project Slated to Begin Monday - Sonoma County Water Agency, Mar 2, 2017

Press Release coverage of the Feb 10, 2017 Emergency Public Meeting - Sonoma County Water Agency, Feb 14, 2017

Initial Press Release announcing the Feb 10, 2017 Emergency Public Meeting - Sonoma County Water Agency, Feb 9, 2017

Emergency Public Meeting - February 10, 2017

An urgent meeting regarding emergency actions to address the flooding of Green Valley Creek at Green Valley Road (aka the “S curve”) was held Friday, February 10, 2017 at 4:00 pm at the Sanchietti barn, 10076 Green Valley Road, at the corner of Sullivan Road. Link to the Feb 10, 2017 Meeting Minutes

Public Meeting - November 17, 2016

A public meeting was held on November 17th, 5:30-6:45pm at the Oak Grove Elementary School Gymnasium, 8760 Bower St., Sebastopol, CA. This meeting was a follow up to our first public meeting on October 14, 2015, and an opportunity to hear about the progress made since we last met.

Links to Presentation Files:

Introduction by Gold Ridge RCD

Flood Zones Map, prepared by Sonoma County Water Agency

Flooding at Green Valley Road and Analysis of Mitigation Alternatives, presented by O'Connor Environmental, Inc.

 

Videos of Green Valley Creek Flooding on Green Valley Road


See timelapse videography of Green Valley Creek flooding across Green Valley Road from January and February 2017 on our YouTube channel
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Information on Green Valley Road Flooding and Efforts to Mitigate

All titles are links to the documents.

Summary of Mitigation Alternatives for Flooding at Green Valley Road, 2016: This document summarizes four project alternatives (or options), from which a preferred alternative was selected. We will discuss these options at the November 17 meeting.

Matrix of Mitigation Alternatives for Flooding at Green Valley Road, 2016 : A quick reference sheet that abbreviates the alternatives (or options) outlined in the “Summary of Mitigation Alternatives for Flooding at Green Valley Road, 2016” (above).

Summary of Analysis of Flooding at Green Valley Road and Mitigation Alternatives, 2015: A previous version of and precursor to the “Summary of Mitigation Alternatives for Flooding at Green Valley Road, 2016” (above), this document includes a number of previously considered project alternatives, most of which were not pursued because they were either ineffective or not feasible.

Sediment Source Assessment for Upper Green Valley Creek, 2014: A separate but related study on the sources and rates of erosion and sedimentation in the Green Valley Creek watershed.

Green Valley Creek /Dutch Bill Creek Watersheds Update Report, 2015: This document summarizes the results of a hydrologic study of the Green Valley Creek watershed. It is more focused on low-flow conditions.

Green Valley Road Flooding Public Meeting flyer, 2015: Flier for the community meeting held last year.

 

Learn More

You can learn more about Green Valley Creek and the natural resource conservation efforts being made there by visiting its watershed page on the Gold Ridge RCD website.

For more information about efforts to mitigate flooding on Green Valley Road, please contact Sierra Cantor at Sierra@GoldRidgeRCD.org, or (707) 823-5244 or request to receive updates about this project by emailing Sierra with the subject line: "Request for Updates on Green Valley Rd Flooding".

© 2016 GRRCD 2776 Sullivan Rd., Sebastopol, CA 95472. All rights reserved.