The two-span bridge on SR 542 across I-5 near Bellingham, WA provides an attractive, low-profile structure. This bridge combines the appearance of a cast-in-place box girder with the advantages of precast, prestressed construction. Using a post-tensioned spliced design, with two girders per span, resulted in clear spans of 95' to 109' across the Interstate highway. The open-topped "tub" girders have 1:7 sloping sides and support a 7½" thick cast-in-place roadway deck. The 6' wide girders are spaced 10 feet apart and, with 8 girders per span, provide an 85 foot wide superstructure for the overpass.
