Several years later, louvered windows were added to the bridge to give interior illumination and to reduce the "box effect" of the windowless span. Extensive repairs in 1992 and 2002 strengthened the structure, and a new roof was installed.
(Reference: Roofs Over Rivers, by Bill and Nick Cockrell)
The waters in our region are beginning to recede. The northern half of the Oregon and Washington State were hit the hardest. A single bridge was partially washed out and a few hundred yards of roadway were completely washed out near Mt. Hood in the northern part of Oregon. I have not heard of any major damage from Washington at this point in time.
Our hydraulics engineer has developed a computer program that will trigger alerts for scour critical bridge during a pre-determined rain event. If a large rainfall occurs the program will tell us which bridges need to be more closely monitored based on the scour susceptibility of the bridge and calculated flows of the river. It is a pretty neat tool for flood events; it helps guide maintenance crews and inspectors when problems start occuring.
I am not sure how much freeboard the Belknap Bridge actually has during low water. The photo that I posted was during pretty highway, just not as much as the news article photo you shared. I can tell you that the approach alignments at the Belknap site would limit any raising of the structure, so I would imagine it is not built to high water standards.
Mike - Is your areas highwater receding yet? Post flood inspections in the offing? Scour seems probable for some of your inventory.
How high is the Belknap off the water at normal levels? I noticed one of your photos does not show much more freeboard than this flood photo shot two days ago http://tiny.cc/e9dz2 Seems a bit unusual for a late 20th century bridge.