LocationJunction City, OR

Project PartnerHamilton Construction Co.

ChallengeInstallation of drilled shafts adjacent to an active railway bridge over the Willamette River without interrupting Union Pacific RR trains.

OverviewCondon-Johnson was contracted to install 7 foot diameter drilled shafts up to 200 feet in depth from a temporary work trestle. The new drilled shafts were adjacent and deeper than the existing bridge foundations which were still carrying the load of 20 to 24 trains per day.

ResultsCondon-Johnson’s experienced personnel oscillated full depth temporary casing to safely and efficiently install the drilled shafts, which included 18 each 7 foot diameter drilled shafts ranging up to 149 feet in depth. The project was divided physically by the existing railroad bridge. Hamilton Contractors constructed a temporary work trestle on both sides of the existing bridge to provide access for Condon-Johnson’s service and dig cranes.