Barrett is an unincorporated community in Mariposa County, California. It is located on the western shore of Lake McClure on the Yosemite Val…Barrett is an unincorporated community in Mariposa County, California. It is located on the western shore of Lake McClure on the Yosemite Valley Railroad 6.5 miles south-southwest of Penon Blanco Peak, at an elevation of 876 feet. The original town site was flooded by Lake McClure.
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