Almost, But Not Quite, California 128

Advance sign for exit leading to California 128 in Geyserville

The upcoming exit on US 101 northbound just south of Geyserville isn't for California 128. That's because California 128 runs through the northern Sonoma County town and then crosses US 101 on the north edge of Geyserville. The upcoming exit is for Geyserville Avenue, the main street of the town, which leads to Highway 128.