Alton Interchange - Purpose and Need

The Alton Interchange project was initiated by the Humboldt County Association of Governments (HCAOG). It is one of HCAOG’s top priorities in the Humboldt County Regional Transportation Plan. It is supported by Caltrans, County of Humboldt, California Highway Patrol, and local cities.

The purpose of this project is to address safety and operational concerns at and near the intersection of Routes 36 and 101 in Humboldt County. Improvements are necessary to decrease the collision rate, facilitate merge and turn movements, and reduce waiting time for turn movements. The interchange will combine ramps, local road extensions, and a grade separation to provide a safe transportation facility, constructed to current design standards.