The first phase, centered around a railroad overpass south of East Stanwood, was completed as scheduled in November 1962, despite part of the overpass collapsing midway through construction. The remaining highway between East Stanwood and US 99 (later rebuilt as I-5) was completed in October 1969, serving a temporary partial cloverleaf interchange until I-5 was expanded in 1972.
The first phase of the project, centered on a railroad overpass south of East Stanwood, was finished on schedule in November 1962, despite some sections collapsing during construction. The remaining highway between East Stanwood and US 99 (later rebuilt as I-5) was completed in October 1969, offering a temporary partial cloverleaf interchange until the expansion of I-5 in 1972.