Mount Diablo Interpretive Association is a non-profit volunteer organization which assists the California Department of Parks and Recreation in maintaining and interpreting Mt. Diablo State Park for its 700,000 visitors each year. Through a continuing program of education, MDIA fosters appreciation and the enlightened use of Mount Diablo State Park. MDIA is proud to have played a major part in raising funds for the original construction of the Visitor Center atop the summit of Mt. Diablo and additional support in the recent renovation in 2010. In addition, MDIA helped develop the Mitchell Canyon Visitor Center and is operated by State Park Volunteers on the North side of the Mountain. Our web site is designed to lead you to a wealth of information on the park and put you in touch with the varied activities on Mount Diablo.