How a steep, inaccessible canyon saved a prehistoric forest from destruction

Countries & Cities · Published 12 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: In the late 1800s, California's massive redwood forests were being decimated by the Gold Rush. Yet, a specific patch of Mount Tamalpais survived. It wasn't just luck; it was the terrain, a strategic private purchase, and a clever use of a new federal law.

During the mid-nineteenth century, the massive coast redwood (Sequoia sempervines) forests once spanned an estimated 810,000 hectares from Oregon to Big Sur. However, commercial logging following the Gold Rush drastically reduced this range. By 2023, only 5% of the historic old-growth remained, restricted to a 450-mile coastal strip. The trees in Muir Woods National Monument survived largely because their location on the steep slopes of Mount Tamalpais made them too difficult for loggers to reach.

The preservation of the grove was a deliberate act of conservation led by figures like William Kent and Alice Eastwood. In 1905, Kent purchased 611 acres of Redwood Canyon to thwart logging and provide visitor accommodations. When the North Coast Water Company threatened to dam Redwood Creek to supply Sausalito, Kent utilized the Antiquities Act of 1906. By donating 298 acres to the federal government, he bypassed local courts and secured the land's protection. President Theodore Roosevelt officially established the national monument on January 9, 1908.

Today, the monument protects 554 acres, including 240 acres of old-growth forest. The ecosystem relies on a delicate balance of moisture; summer fog provides vital 'fog drip' during dry seasons, while heavy winter rains soak the Centissima series soil. While the forest is a sanctuary for species like the northern spotted owl, it faces challenges. The local coho salmon population is highly vulnerable, with the species listed as endangered in its evolutionary significant unit, as recent years have seen significant declines in spawning numbers.

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