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OneShoreline
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The San Mateo County Flood and Sea Level Rise Resiliency District (or OneShoreline) is an independent government agency advancing regional climate resilience. We address sea level rise, flooding, erosion, and other climate change impacts.
King tides (unusually high tides) are coming to California on December 4-5! Join a king tide walk to see what our coastline could look like with 1-2 feet of sea level rise. Arriba South Coast is hosting one at the Pescadero State Beach: bit.ly/tidewalk25

#kingtides #sealevelrise #coastalresilience
November 24, 2025 at 10:16 PM
OneShoreline Board and staff toured Stanford’s Jasper Ridge Biological Preserve, learning about its geology, ecology, and the complex issues of Searsville Dam—balancing fish passage restoration with downstream flood protection. Huge thanks to our docent, Jerry Hearn, for this informative tour!
October 31, 2025 at 4:25 PM
Help us keep the San Francisco Bay clean by participating in 2025 Coastal Cleanup Day!

Date: Saturday, September 20, 2025
Time: 9 am - 12 pm
Location: Utah Bridge, 180 Utah Avenue, South San Francisco

For more info: www.smchealth.org/general-info...
Coastal Cleanup Day 2025 - San Mateo County Health
Join us for the 41st Annual Coastal Cleanup Day!  Saturday, September 20 from 9:00 a.m. to noon, and all month long! ...
www.smchealth.org
August 25, 2025 at 7:57 PM
Groundwater levels in coastal communities, including the SF Bay Area, will rise due to sea level rise. New legislation advancing through Congress would direct USGS to study this issue across the nation.

www.kqed.org/science/1997...

#GroundwaterRise #SeaLevelRise #ClimateResilience
Lawmakers Push to Map Groundwater Before It Swamps America’s Infrastructure | KQED
A Bay Area representative wants to map rising groundwater, a hidden climate threat for the region that could flood infrastructure and spread pollution.
www.kqed.org
July 30, 2025 at 11:54 PM
Great visit this morning with Dr. Chela Zabin (Smithsonian) and Prof. Carina Anttila-Suarez (Skyline College) to explore a living shoreline pilot in Brisbane, CA—boosting coastal resilience and offering students hands-on monitoring experience. #NatureBasedSolutions #LivingShoreline
June 11, 2025 at 8:44 PM
📸 Got photos of flooding in San Mateo County from past storms? OneShoreline and ISeeChange are collecting them to better understand local flood patterns and support future resilience efforts.

Your photos can make a difference!
Learn more + share here:
🌐 www.iseechange.com/projects/san...
April 16, 2025 at 10:27 PM
The City of San Bruno is hosting a Community Resilience Workshop on Thursday, April 24, 2025. Help build a more sustainable San Bruno by providing your input at this workshop!
www.eventbrite.com/e/community-...
April 14, 2025 at 4:38 PM
Sea-level rise is putting more CA communities at risk — and Redwood City tops the list for severe coastal flooding, according to the SF Chronicle. OneShoreline's CEO also spoke with the Chronicle about the broader vulnerability of San Mateo County.

More here: oneshoreline.org/2025/04/04/s...
April 4, 2025 at 9:25 PM
🌍 Earth Day Creek Cleanup! 🌿

Join us on April 26, 2025, at Colma Creek (South San Francisco) to help keep our waterways clean! Let’s make a difference together. ♻️💙

#EarthDay #Volunteer #Cleanup #Sustainability
March 27, 2025 at 4:45 PM
🔥 Be Wildfire Safe & Ready 🔥
Join the San Mateo County Department of Emergency Management this April for a FREE, in-person event designed to help you prepare for wildfire season. Don’t wait—protect your home, your family, and your community!
March 25, 2025 at 5:39 PM
🌊💬 #SanMateoCounty—stay weather aware with street flooding and washouts possible. Use ISeeChange.com to track and report what you’re seeing in your neighborhood. Your observations will inform local solutions from OneShoreline to protect our communities. ISeeChange.com/campaigns/san-mateo
March 12, 2025 at 5:08 PM
Caltrain is studying the impacts of climate change and extreme weather on their systems. Take the survey and share if you’ve experienced service interruptions for a chance to win a $100 gift card.

Take the survey: www.surveymonkey.com/r/CaltrainCCVS
February 27, 2025 at 9:40 PM
KneeDeep Times featured OneShoreline’s Millbrae & Burlingame Shoreline Resilience Project! 🌍✨

Read about our work along the Bay shoreline: ⬇️
🔗 www.kneedeeptimes.org/high-concept...

#ClimateResilience #SeaLevelRise #ShorelineProtection #SanMateoCounty
February 12, 2025 at 10:40 PM
Is your street flooded? Seeing erosion or infrastructure issues? Even if your street stayed dry, your experience matters! Share your storm, flooding, and erosion observations on ISeeChange.com (always free). 🌧️🌊 #SanMateoCounty #FloodWatch
February 4, 2025 at 6:49 PM
OneShoreline marks 5 years of building climate resilience in San Mateo County! 🌊✨

Check out our latest newsletter to read about our journey so far and our vision for the future: mailchi.mp/cf17fbf8d494...
5 years of advancing climate resilience
mailchi.mp
January 31, 2025 at 10:40 PM
Rainy season is here, San Mateo County! 🌧️ Sign up at ISeeChange.com—a free platform to track storms, flooding, and erosion in your neighborhood. Share your stories to help @OneShoreline design resilient infrastructure! �� ISeeChange.com/oneshoreli#ClimateResiliencelience
December 21, 2024 at 1:52 AM
Help document King Tides in San Mateo County this weekend (Dec 13-15)!

Share photos from:
Bay Trail (Burlingame/Millbrae)
Brisbane Marina
Ravenswood Open Space Preserve
Pacifica Pier
Oyster Point & Pillar Point

Submit to California King Tides Project (www.coastal.ca.gov/kingtides)

⚠️ Stay safe!
December 12, 2024 at 6:22 PM
King Tides return to California Dec 13-15, 2024! These unusually high tides show what our coastlines could look like with 1-2 ft of sea level rise.

📸 Capture King Tides near you & share them with
the California King Tides Project!
www.coastal.ca.gov/kingtides/
December 5, 2024 at 6:25 PM