Normally, bridges moving is not something an engineer wants to see, but this weekend construction crews slid the first of two new bridges at the Blacks Creek Interchange with Interstate 84 sixty feet into place – where it will stay for decades to come.
The slide-in-place maneuver was designed to reduce impacts to the heavily-traveled Interstate. Crews construct the bulk of the new bridge right next to the existing structure. When ready, the old bridge is demolished and the replacement structure is slid into place.
“The driving force behind choosing a lateral bridge slide method was our focus on the people we serve and their ability to get where they need to go.” said Patrick Kelly, ITD project manager overseeing the work. “We were able to keep lanes open during the entire bridge construction process. Once it was ready, we closed the eastbound lanes, demolished the old structure, pushed the new bridge into place, and are wrapping up construction on the adjacent roadway. In the end we will have closed interstate lanes of traffic for weeks not months.”
The whole process, from demolition to re-opening traffic will take two to three weeks. Normal bridge replacements can take several months. With the new bridge in place, crews have just a few final items including work at the bridge abutments and repaving approaches.
To get the bridge from temporary footings to its permanent home, crews lay down Teflon pads and cover them with dish soap. It’s a surprisingly effective way to reduce friction and easily move the massive structure.
“Seeing how smoothly the bridge slid into place was very satisfying.” said Kelly. “It has been months of planning, preparation, and a lot of hard work to get to this point. The crews from Knife River have done a wonderful job and should be very proud of the work they’ve done.”
This method has been used before in the Gem State when, in 2014, the Lardo Bridge on ID-55 in McCall was replaced. There, as it is at Blacks Creek, the highway is an essential connection and disruptions are very impactful.
The second bridge for the westbound lanes has been constructed next to the old structure. Crews are currently finishing up the eastbound side of the interchange including work on ramps and Blacks Creek Road. They will be ready to slide the westbound bridge into place in early August.
For more information about the project, visit ITDprojects.org/i-84-blacks-creek-interchange/.
Source: Idaho DMV