Chickaloon River Bridge Replacement
Milepost 78 Glenn Highway (20 miles east of Sutton, AK)
Start Date: October 2015
End Date: August 2016
Hamilton was the general contractor for this Federal Highway Administration (FHWA) project 20 miles east of Sutton, Alaska. The project included the construction of a new three-span 45 foot by 350-foot-long precast bulb-tee girder bridge with cast-in-place deck. The two center piers were founded on 10-foot diameter drilled shafts approximately 55 feet deep and the two abutments included five-foot diameter drilled shafts installed to approximately the same depth. Construction required building a seven-span temporary work trestle over the Chickaloon River, which included two driller access slips.
With an extremely aggressive schedule, our team put exceptional planning skills and leadership to use. Our team was heavily involved in the rapid startup of the bridge replacement and worked directly with FHWA and the project stakeholders, including direct coordination with the Alaska Dept. of Fish & Game (ADF&G), Dept. of Natural Resources (DNR), and Alaska Dept. of Transportation & Public Facilities to create the initial schedule accounting for tight timelines, sensitive environmental areas, and intense work windows. We managed the process for obtaining Right of Way, DNR, and ADF&G permits successfully. During the project start up, we helped identify that the original shaft design and location was problematic. Our proactive approach led to assisting the geotechnical engineer to modify the drilled shaft design and methods of construction to comply with US Army Corps of Engineers permit conditions. Not only did careful planning allow the project crews to maximize the shoulder seasons, construction on the new three-span precast bulb-tee girder bridge was expeditious and smooth.