Morrison Bridge, Bascule road bridge in Portland, Oregon, United States.

Morrison Bridge is a bascule bridge over the Willamette River in Portland, Oregon, completed in 1958. Its main span consists of two 237-foot steel truss spans with a 340-foot double-leaf bascule between them, carried on concrete piers. A concrete control tower with canted windows stands at the west end, and the deck holds six traffic lanes plus a barrier-separated path for pedestrians and cyclists on the south side.

The structure replaced an earlier crossing and opened in 1958 to improve connections as Portland grew. This bridge represented the city's modernizing transportation needs at that time.

The bridge is named for John L. Morrison, a Scottish immigrant who built the first house on Morrison Street; the street, not the bridge, carried the name first. Since 1987 it has been lit by the Willamette Light Brigade, and computer-controlled LEDs now let each of eight pier zones take a different colour, with patterns bookable for a fee.

The pedestrian path and bikeway provide safe passage for those crossing on foot or by bicycle, while a movable span allows boats to pass underneath. Walking or cycling outside rush hour makes the crossing more comfortable.

The bascule mechanism still operates to raise and allow boats to pass through, a working detail that most people driving daily never notice. This feature links the busy city streets above with active river traffic below.