Morrison Bridge

River mile: 12.8

Opened: 24 May 1958; precursors: 1887, 1905

Type: steel double-leaf Chicago-style fixed trunnion bascule movable bridge

Main Span Length: 284 feet

Center Height to Water: 69 feet

Outside Width: 78 feet (six traffic lanes, with two 5-foot sidewalks)

Color: Aluminum gray

Cost: $12.9 million

Owner: Multnomah County

Engineer/Designer: Sverdrup & Parcel, St. Louis Missouri; Moffatt, Nichol & Taylor, Portland, Oregon

Access: pedestrians, bicycles allowed

Bridge Opening Signals audible: one long, three short; radion

Average Daily Traffic: 50,000

Historic American Engineering Record OR-100