Starting Monday (January 29), Panoramic Highway will be reduced to a single lane at milepost 2.26, just south of the Mountain Home Inn, allowing for alternating two-way access controlled by a temporary traffic signal. The lane closure is required for construction of a retaining wall. It going to take about 6 months to do the fix.
Travelers between the Mount Tamalpais area and Stinson Beach should expect traffic delays of up to 10 minutes. Expedited access will always be provided for active emergency service vehicles. The single lane traffic control is expected to be in place through the end of March, but the duration could be extended if weather impacts the construction schedule.
The construction zone is a 700-foot stretch of road approximately 1.3 miles northwest of the intersection of Panoramic Highway, Sequoia Valley Road, and Muir Woods Road — locally known as Four Corners. That section of Panoramic Highway is a popular route with tourists visiting Mount Tamalpais State Park, Muir Wood National Monument, the Golden Gate National Recreation Area, Point Reyes National Seashore, and Marin’s Pacific beaches.
The retaining wall is part of a slide repair project that began in November 2023. The Marin County Department of Public Works (DPW) is managing the slide repair project which involves installation of new retaining walls, guardrails, and pavement along Panoramic Highway. The damage was caused by a major storm in October 2021 that dumped 12 inches of rain on the mountain within a 24-hour period.
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