I-35, I-535, Hwy 53 Twin Ports Interchange

Videos

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• Miller and Coffee Creek, September 2021
• TPI progress update, July 2021
• Windblade moves through project, July 2021
• Bridge pier demolition, June 2021
• 27th Avenue bridge deck pour, May 2021
• TPI project tour, May 2021
• Miller and Coffee Creek, December 2020
• 27th Avenue bridge demolition, part 1, November 2020
• 27th Avenue bridge demolition, part 2, November 2020
• 27th Avenue bridge demolition, part 3, November 2020
• Lower Michigan Street utilities, August 2020
• TPI project update, May 2020

Photos

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• Beam setting, 2023
• Beam setting, 2023
• TPI update, June 2022
• Twin Ports Interchange January 2022
• Progress comparison photo, January 2022
• Southbound I-35, March 2023
• Miller and Coffee Creek, January 2022
• Miller and Coffee Creek inlet comparison, January 2022
• One of the last spans of steel bridge girders to be taken down, 2021
• Cutting up old steel bridge girders with torch, 2021
• Miller and Coffee Creek box culvert - construction progress of center 300-foot long section, 2021
• Miller and Coffee Creek box culvert - steel H-pile installation, 2021
• Coffee Creek open channel progress, 2021
• New Miller Creek culvert outlet, 2021
• Newly designed Coffee Creek channel flows toward the combined Coffee Creek and Miller Creek culvert, 2021
• Crews build new bridge pier, 2021
• First new bridge pier has been constructed, 2021
• Bypass being constructed to hold I-35 traffic for the next two years, 2021
• Lower Michigan Street ready for southbound interstate traffic, 2021
• Bridges starting to come down on the TPI project, 2021
• Bridges starting to come down on TPI project, 2021
• Bridges starting to come down on TPI project, 2021
• Bridges starting to come down on TPI project, 2021
• City of Duluth: Lower Michigan Street Gas Main. The gas main has been relocated because it was in the way of new bridge and wall foundation construction for the Twin Ports Interchange project, 2020
• City of Duluth sanitary lift station being relocated, 2020
• MnDOT has three billboards located in Minnesota and Wisconsin, reminding travelers of our upcoming Twin Ports Interchange project, 2020
• The challenge is that we have very poor/weak soils in this area. Much of it is old filled in bay. To transfer the load of the fill we plan to place to a solid underlying material, we are placing "ground improvements," which is basically a grid pattern of 16-inch grout columns inserted into the ground to a hard layer. This will support the eventual roadway fill. 2019
• There are grout columns under the fill holding it up. The fill is reinforced, that is why it is so blocky. We needed to keep it narrow because we did not have much room to work now. 2019
• The entire installation is instrumented for settlement and we are also looking to see if the ground improvements are moving any soil laterally. We don't want to be putting pressure on existing bridges and utilities. 2019
• MnDOT is testing the process to validate our design and perhaps make it more efficient. We cannot afford to have settlement when we are done.
• In 2019, crews completed work at the corner of Railroad Street and Garfield Avenue in anticipation of the Twin Ports Interchange project.
• Crews made improvements to several local streets, including Garfield Avenue and Railroad Street, to carry extra traffic once the Twin Ports Interchange project begins.