The bridge was built to replace a pedestrian cablesuspension bridge completed in 1888. This existing bridge was utilized continuously during the construction process of the replacement, not only as access to the site for men and materialsassembling the box steel frames and pouring the reinforced concrete from its walkwaybut also as the main support system during the completion of the arch itself. Construction was made difficult by the engineering challenges posed by the great depth of the river at the site and worse from the need to manage and accommodate the frequent and ever increasing water traffic on its surface. The completed bridge was opened to the public on December 28, 1922, with the cost of construction reported as $300,000. The piers were designed to accommodate public restrooms. The deck widens at the piers to provide room for the stairways – one on each side of the deck – that once descended to the restrooms. Repeated vandalism led to the closure of the restrooms in 1937, and the stairway entrances were covered over with concrete. Windows for "observation balconies" that were originally included in the piers, at the tops on both sides, were also sealed in concrete after closure. The bridge was added to the National Register of Historic Places Bridge ) on July 1, 2005. In March 2009, ODOT imposed new weight limits for vehicles crossing the bridge, after inspections revealed damage to some of the structure's floor beams. Large commercial vehicles, or any vehicle weighing more than 14 tons, were banned from using the bridge. Among other impacts, the restriction meant the rerouting of all TriMet buses. The two routes using the bridge at that time, 35-Macadam and 154-Willamette, were rerouted across the Abernethy Bridge. In 2010–2012, the Oregon City Bridge was given an extensive rehabilitation, overseen by ODOT. Work began in July 2010, and the bridge was temporarily closed to all traffic starting in January 2011. The bridge reopened on October 15, 2012, with the $15 million restoration project nearly completed. The final items of work were completed in early 2013. According to ODOT, one of the "intentions" of the project was to "restore original load-carrying capacity", which would permit TriMet buses to resume using the bridge. However, as of September 2013 TriMet service had not returned to the bridge, and it is unknown whether the transit agency is planning to restore the former routings, or whether ODOT actually has restored the old load limits.
Current use
As of 2000, the bridge carried 12,800 vehicles per day, which represents only a 40% growth in traffic since 1953, when a public debate was held about building a parallel bridge next to the existing bridge. While the Oregon City Bridge did not get twinned, the George Abernethy Bridge opened in 1970 and has since become the major route through the area. TriMet buses crossed the bridge until March 2009, when a new weight limit temporarily banned buses and heavy commercial vehicles from using the bridge.
