Adobe Gulch is a valley in San Mateo County, California, about 1.2 miles (1.9 km) long, located on the west side of Upper Crystal Springs Reservoir.

[1] It has an elevation of 97 meters, or 318 feet.

It is located at 37-29'53 N and 122-20'51 W.[2] Adobe Gulch is the northernmost of several tributaries (and the only one named by the USGS[3]) that descend the eastern flank of the Santa Cruz Mountains to Upper Crystal Springs Reservoir (and historically, Laguna Creek)[citation needed].

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