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Clayton is a city in Contra Costa County. The population was 10,897 as of the 2010 census. In 1857, the town of Clayton was laid out and founded by Joel Henry Clayton (1812-1872) and his two younger brothers. - https://en.wikipedia.org/wiki/Clayton,... more
The Center has displays about various aspects of Mount Diablo State Park, including geology, wildlife, trails, and plant life. Clothing, souvenirs, and interpretive books and pamphlets are for sale. There are also postcards, note cards, trail maps, a... more
Mount Diablo State Park image
Mount Diablo State Park park of the California State Park System. It was established in 1921. The park encompasses over 20,000 acres. The summit of Mount Diablo has an elevation of 3,849 feet -- it is the highest point in Contra Costa County. Rec... more