Demolition and construction of a new Cloverdale Road bridge over Interstate 84 is expected to go out for bid Oct. 1, an Idaho Department of Transportation official said.
The ambition is to demolish the fire-damaged bridge in mid to late January and have a new bridge with more lanes open in July, ITD spokesman Jake Melder said.
“This is a very accelerated program,” Melder said. “We recognized the importance of Cloverdale Road.”
All freeway traffic will likely be shifted to one side of the freeway on four nights to allow for demolition of half the bridge each night and installations of girders on each side. Lanes may be reduced for installation of a center pier, he said.
“Our hope is to impact freeway travel as little as possible,” Melder said.
The Cloverdale Road bridge over I-84 was damaged in a fiery June 16 seven-vehicle crash that killed four people. The Idaho Transportation Board on June 22 approved $6 million to $8 million to build a new bridge.
The Cloverdale bridge has been closed since the accident.
The new bridge will have four travel lanes, shoulders and sidewalks that reflect Ada County Highway District’s master plan for Cloverdale. The new bridge will have higher clearance over the freeway and will also be built to accommodate a potential widening of I-84 to five lanes in each direction.
The Cloverdale bridge was built in 1966 at the time that Interstate 80N was originally built in Boise.
No on-ramps or off-ramps will be added. Cloverdale falls within the 3.4-mile stretch with no ramps between the Interstate 184 interchange and Eagle Road.
“Folks have been asking if we are putting in off-ramps,” Melder said.
He said ITD has determined the stretch does not meet mobility or congestion standards to warrant additional ramps.
The American Association of State Highway and Transportation Officials recommends minimum spacing between interchanges of 1 mile in urban areas and 2 miles in rural areas.