Marsh Creek 8 is property owned by Save Mt. Diablo (SMD). SMD acquires land around Mt. Diablo State park to preserve and protect it, and when appropriate, turns the land over to the state park system.
Their mission statement:
Save Mount Diablo's mission is to preserve Mount Diablo's peaks, surrounding foothills and watersheds through land acquisition and preservation strategies designed to protect the mountain's natural beauty, biological diversity and historic and agricultural heritage; enhance our area's quality of life; and provide recreational opportunities consistent with protection of natural resources.