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Both gravel routes have been canceled to prevent trail damage after very wet weather less than 24 hours before our event. See the notice on our Century home page for details.


The 100K gravel route explores some of the greatest hits in our wonderful East Bay Regional parks. The first half of the day will take you through Sibley, Tilden and Wildcat before turning south to revisit Sibley en route to Chabot where the difficulty ramps up! The route covers about 57 miles with about 6,600 ft of elevation gain. This route will challenge you while helping sharpen your early season fitness and affording you the beauty of the East Bay.

Alternative Car-Free Start

The alternative start in Tilden Park is not available for this route. You must sign in at St Mary's College.


Below is a tentative map. Note that you can click on View Full Version to see more details. Also read our information regarding Electronic Navigation.

Cue Sheet

We have a tentative cue sheet available now. You will receive a final cue sheet at registration.

View from the gravel route
by Mike Wood