Just north of San Francisco is the Muir Woods National Monument in Marin County, CA. One of the remaining old growth forests on the planet, the forest is full of centuries old Coastal Redwoods that tower hundreds of feet above. One of the beautiful features of the Muir Woods is the Redwood Creek that meanders through the heart of the forest. Redwood Creek runs off of Mount Tamalpais through Muir Woods and out to the Pacific Ocean at Muir Beach. The creek is home to some of the last native California Coho and Steelhead Salmon in the area. They return each winter from the Pacific Ocean to spawn after the first heavy rain of the season.