Mt. Hamilton backside road stories

The old road followed Arroyo Bayo.

The old road followed Arroyo Bayo.


One of the most wild and scenic roads in the Bay Area is Hwy 130, San Antonio Valley Road, on the backside of Mt. Hamilton.

I’ve ridden there since 1980 and it never fails to impress. Over the years I’ve wondered about that dirt road alongside Arroyo Bayo after the hill out of Isabel Creek.

Jobst Brandt, who rode on the backside of Mt. Hamilton more than any cyclist, may have mentioned riding there, but I’ve forgotten.

But Peter Locke has not forgotten, and he rode with Jobst. He told me recently by phone how they rode through the creek. He had fond memories of fording the creek numerous times, as well as crossing a reservoir. Here’s Google Maps after the Isabel Creek climb.

Red line shows where the road went.

Red line shows where the road went.

I looked at a USGS topographic map from 1955 and sure enough the dirt road that you see today along the creek was the main road.

It’s fast disappearing, but it’s still used by landowners in some sections.

I wouldn’t want to try riding there today, but back in 1956-57 when Jobst, Peter and others rode it, the road was maintained.

The road enters a narrow section.

The road enters a narrow section.


Here's where the first section of road returns to present Hwy 130.

Here’s where the first section of road returns to present Hwy 130.

USGS topo map from 1955.

USGS topo map from 1955.

One Response to “Mt. Hamilton backside road stories”

  1. Brian Coyne Says:

    This stretch also seems to have had a different name in the past: it’s marked as “Bayou Road” on this set of 1956 Santa Clara Co maps: http://www.historicmapworks.com/Atlas/US/9516/Santa+Clara+County+1956/

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