Discover the trails of Contra Loma and and the fascinating history of Black Diamond Mines up close. Located on what was once the populated part of Contra Costa County, Black Diamond Mines and Contra Loma Regional Parks offer great trail running, panoramic vistas and a chance to see what much of local area was like in centuries past.
Start times:
Half Marathon: 8:00 10K: 8:15 5K: 8:30