Bay Area/ San Francisco

Marin Scrambles As El Niño Threatens To Swamp Ross Valley

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Published on July 02, 2026
Marin Scrambles As El Niño Threatens To Swamp Ross ValleySource: Wade Austin Ellis on Unsplash

Marin County is quietly shifting into storm mode, funneling cash and crews into some of its most flood-prone corners from Ross Valley out to the bayshore, all in anticipation of a potentially record-breaking El Niño winter. The early push centers on beefing up pumps and drains and getting sandbags and other quick-response gear in place before king tides and big storms start lining up.

As reported by the Marin Independent Journal, the Flood Zone 9 advisory board last Thursday signed off on an initial $250,000 from the county's operating budget for fast-track preparations. Public Works engineering manager Robin Bartlett told the paper the money will go toward check valves, small portable walls, stockpiled sandbags and other emergency materials, noting that the funds are coming out of the operating budget with room for later adjustments if conditions demand it.

What officials are doing

The Marin County Flood Control District says crews already handle seasonal maintenance such as testing pumps, clearing channels and inspecting levees, and will coordinate with towns across the Ross Valley to pre-stage equipment and materials, according to the Marin County Flood Control District Zone 9 page. The district also runs a network of gauges and sandbag stations that helps crews quickly identify and respond to trouble spots when storms roll through.

Why officials are worried

Federal and regional scientists warn that a strong El Niño could temporarily boost baseline sea levels and turn king tides and winter storms into much more damaging events, with experts saying temporary surges of two to three feet are possible at the peak of major storms. That outlook, which includes a high chance of a record-setting El Niño, was laid out by climate scientists in reporting by KQED.

Higher elevations within the Ross Valley watershed have flooded in past storms when tributaries feeding Corte Madera Creek were overwhelmed, and officials have singled out neighborhoods along the bayshore from the north end of Sausalito through Corte Madera and Larkspur as particularly vulnerable once tides hit about seven feet. Those local weak spots were a central part of the Zone 9 discussion, according to the Marin Independent Journal.

How residents can prepare

County public-safety pages urge residents to sign up for AlertMarin, find the nearest sandbag stations and move cars and valuables off low-lying streets before forecast high-tide windows. The county also recommends testing sump pumps and keeping basic emergency supplies on hand. For local checklists and sandbag station locations, residents can turn to the county emergency portal and preparedness resources (AlertMarin, ReadyMarin).

The Zone 9 advisory board, chaired by Larkspur council member Gabe Paulson, meets regularly and can reconvene to shift funds if the winter forecast takes a sharper turn, county documents show. County officials describe the $250,000 allocation as a first step meant to buy time and protect property while multi-year flood control projects continue to move forward.