- Henness Ridge Fire Tower - Yosemite National Park CAThe Henness Ridge Fire Tower was constructed by the Civilian Conservation Corps (CCC) in 1934. It was actively used until 1966, but is now empty. The Henness Ridge Fire Tower was one of several fire protection buildings constructed in the Sierra under the guidance of John D. Coffman as a part of a comprehensive fire prevention plan developed in response to difficulties encountered during a 1928 fire near Sequoia National Park. The Henness Ridge lookout is a fine example of the rustic architecture style developed by the National Park Service (fire towers outside the park are simpler steel and wood structures). It is...