Mendocino County

Sea Level Rise

Roadway Impact Study

The Mendocino Council of Governments (MCOG) has launched the Sea Level Rise Roadway Impact Study (the study) to identify and prioritize Mendocino County and city-managed coastal roads throughout Mendocino County that are most vulnerable to sea level rise. Flooding, erosion, and storm surge are already affecting many low-lying roads and bridges, with impacts expected to worsen as the climate changes. This study is a crucial first step in planning potential roadway adaptation strategies, addressing Mendocino’s most pressing climate-related transportation challenges, and helping to protect our coastal communities by ensuring safe, reliable transportation access now and into the future.

Using grant funding from Caltrans, MCOG has identified 14 potentially at-risk roadway segments and is seeking community input to help determine the five segments that will move forward with focused planning analysis. These sites will ultimately be selected based on frequency of use, climate vulnerability, engineering feasibility, community impact, and input , and other factorsgathered from the community survey and upcoming community workshops. For more information on how to get involved, please visit our Community Outreach page. Please keep in mind that while the study cannot address all potentially at-risk sites, it will lay the groundwork for future planning and funding opportunities in the most urgent areas.

Point Cabrillo Drive, partially closed due to cliff erosion .

Old Coast Highway in Gualala, at risk of being impacted by cliff erosion .

MCOG is hosting two in-person and one virtual community workshops to provide an overview of the Sea Level Rise Roadway Impact Study and gather feedback from the community on which locations should be prioritized for further study. All workshops will include a formal presentation, followed by time for questions and answers, and an activity to collect your feedback.

Wednesday, March 25, 5:30-7:00 p.m., Point Arena City Hall, 451 School Street

Thursday, March 26, 5:30-7:00 p.m., Fort Bragg Town Hall, 363 Main Street N.

Tuesday, March 31, 5:30-7:00 p.m., Join us online: www.tinyurl.com/MCOGRoadway or dial-in at 1-669-900-9128 and enter webinar ID: 823 2266 8517#

Should you need Spanish interpretation, please email info@mendocinoSLRstudy.org by Friday, March 13 so that we can ensure that is available on the date you plan to attend.

Si necesita interpretación al español, envíe un correo electrónico a info@mendocinoSLRstudy.org antes del viernes 13 de marzo para que podamos asegurarnos de que esté disponible en la fecha de su asistencia.

After selecting the top five locations, the project team will explore adaptation options to account for the current and future effects of climate change, with the goal of preventing or minimizing harm. Adaptation options may include elevating or realigning roads, improving drainage, using natural shoreline buffers, or designing flood protection systems. In some areas, alternate routing or gradually moving buildings and roads to safer ground may also be considered. After developing adaptation options for each of the five selected locations, the study will evaluate the benefits, risks, and feasibility of each option and recommend a preferred adaptation approach for that location. While no construction will occur as part of this study, the findings will inform future planning and funding efforts. 

Community input is a vital part of this process. We encourage you to attend one of our upcoming community workshops in March,  or email info@MendocinoSLRstudy.org to share your thoughts on the most at-risk roads. Your feedback will help identify at-risk sites and guide strategies that reflect the needs of residents, businesses, and emergency services.

Left: Brewery Gulch Road in the City of Mendocino. Right: Close-up of cliff erosion occurring near Heeser Drive in the City of Mendocino

Timeline

The Sea Level Rise Roadway Impact Study was launched in May 2025. We expect to select the five sites to be included in the study by mid-April 2026 and to complete the study in winter 2026. There will be opportunities for public engagement throughout the process.

This is an example of an adaptation option produced for another project – the adaptation options for the five selected sites presented in the final Feasibility Report will look similar.