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Mount Diablo Trails Alliance
P.O. Box 812
Diablo, California 94528

Mount Diablo Trails Alliance (MDTA) is a 501(c)(3) nonprofit trails stewardship and access advocacy organization. MDTA is volunteer-led, building a Shared Stewardship model with California State Parks, focusing on Better Trails | Greater Access for all park visitors. Federal Tax ID # 99-4480469.