I-5: Fern Valley Interchange, Unit 2
Start Date: 2013
End Date: September 2016
Owner: Oregon Department of Transportation
Hamilton was the prime contractor for this two-year freeway interchange improvement project. This project increased traffic capacity and improved mobility for the fast growing Southern Oregon community of Phoenix – just south of Medford.
The project scope included the construction of two new bridges along Fern Valley Road. The first is a prestressed 75-inch Bulb I two span structure over Bear Creek that was constructed in stages with driven pile and MSE wall foundations.
The second structure is a two-span prestressed box beam bridge over I-5, founded on MSE walls and pile foundations with drilled shafts and columns for the center pier. Both structures feature decorative ornamental rail and aesthetic wall elements with cast-in-place decks and stamped concrete islands. The balance of the project consists of retaining walls (cast-in-place as well as MSE), all with ornamental features, major concrete paving with ornamental stamped islands, roadwork, landscaping, electrical, flatwork, asphalt paving, fencing, and truss sign bridges.
The majority of bridge and retaining wall work will commence in mid-2014 and complete in late 2015, with an overall project completion time of September 2016. Traffic staging will be an important and sensitive component of this job.
Fun Fact: This project marks the first time a “Diverging Diamond” intersection design will be used on the West Coast of the United States. Used successfully in other parts of the country, this configuration should improve traffic flow as projected traffic volumes increase, and requires a smaller “footprint”.