Work on the portion of I-490 west of the Inner Loop began and initially extended from NY 259 in Chili to Mount Read Boulevard west of downtown. This section was completed by the following year. The remainder of the freeway west of Rochester was opened to traffic as far west as NY 36 near Churchville and finished by 1968. The last two gaps in the freeway—from Mount Read Boulevard east to the Inner Loop in Rochester and from Bushnell's Basin southeast to the Thruway in Pittsford and Victor—were filled in the early 1970s.