Photos from the Save Mount Diablo and Brazen Racing 2013 Diablo Trails Challenge. The 50K starts at Round Valley Regional Preserve near Brentwood and 7000+ ft of climbing later, ends at Castle Rock Regional Park near Walnut Creek. For more information about Save Mount Diablo and the Trails Challenge see:http://www.savemountdiablo.org/activities_events_50k.html
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