Lift span deck replacement completed on Morrison Bridge

September 28, 2011

One eastbound lane on the Morrison Bridge is closed in February and early March to allow Multnomah County to inspect the lift span deck. 

The fiber reinforced polymer (FRP) deck that was installed on the lift span in 2011 – 2012 has shown signs of premature wear.  Deck attachments for some panels have loosened.  County staff have monitored the deck surface regularly in recent months as a precaution.  The inspection will allow county crews to remove deck panels and inspect them for wear.  Degraded panels will be replaced with new panels. 

A forensic engineering consultant is working with the county to analyze the worn FRP panels to determine the cause of the wear and the extent and method of repair needed.  The county is pursuing litigation related to the FRP fabrication and installation by other parties.

The SW Naito Avenue onramp and the SE Water Avenue offramp from the bridge will remain open during the work.  All freeway ramps will remain open also.  On weekdays, the middle eastbound lane will be closed on the lift span from 7 a.m. to 3 p.m. for safety during the work. 

After panels in the eastbound lane are inspected, the outside westbound lane will be closed for a similar inspection.  The county expects that information gained from these inspections will help define the extent and method of repairs needed for a long-term solution for the deck.

Multnomah County maintains the Morrison Bridge, five other Willamette River bridges, and 300 miles of roads. For more information, visit www.multco.us/bridges.