Longest Bowstring Arch Bridge in the USA Removed

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The Kern Bowstring Arch Bridge to be dismantled and stored awaiting relocation to a new home.

MANKATO, MINNESOTA- It finally happened. After 147 years spanning the LeSueur River south of Mankato as the longest bowstring arch bridge in the US (and second longest in the world behind the Blackfriars Road Bridge in Canada), the Kern Bowstring Arch Bridge is off the river and awaiting for a new home.  Construction crews on Thursday lifted the 189-foot long bowstring arch bridge, in one piece, off its stone foundations and placed it in the field to the east of where it once stood.

One of the main obstacles that workers faced was the issues with the crumbling eastern abutment. “We were all kind of holding our breath,” said Lisa Bigham, state aid engineer for the Minnesota Department of Transportation’s District 7 in an interview with Minnesota Public Radio News. “It took a while to get everything kind of in place, the cranes to be positioned where they needed to be. Then, we were just kind of watching. And then, all of a sudden you could see air in between the bridge and the abutment. And it actually went very smoothly.” The eastern abutment had been coming apart, piece by piece in the past 5-10 years thanks to years of erosion and neglect, raising concerns across the board, from engineers and preservationists to even locals that the historic structure could potentially collapse. The structure had been closed to all traffic since 1989, with the township road having been abandoned. But nonetheless, the workers were satisfied with the lifting as it went smoothly as it could.

With the bridge standing in the nearby field, the wrought iron structure will be disassembled and stored in containers awaiting relocation for reuse as a bike and pedestrian crossing. Currently, MnDOT is soliciting proposals for reusing the bridge at a different location on a statewide level. “The pieces will be kept safe and dry,” Bigham said. “And so then whoever gets to take this bridge in the future, will be able to put the pieces back together and they’ll have a really cool bridge.”  Federal and state funding has been placed aside for the project, with some funding having already been collected prior to the move. Carlton Companies of Mankato bidded $595,660 for the move itself. Because many bridge parts may need to be sandblasted and/or repaired before being reassembled, the cost for completing the whole project, including rehabilitation and reassembly is still unknown. The bottom line is the bridge is out of the water and is safe on land. The question will be what the future will hold for the bridge. That will be answered in the coming months.

The Kern Bowstring Arch Bridge was built by the Wrought Iron Bridge Company in 1873, 15 years after the creation of the State of Minnesota. It was also known as the Yaeger Bridge, named after the nearby farm owned by George Yaeger. The structure is all wrought iron with pinned connections. It was listed on the National Register of Historic Places in 1980, and the relocation project will not affect its status. The bridge is the last of its kind in Minnesota, even though dozens of them had existed mainly in the southern half of the state up until the 1970s. The bridge was closed to traffic in 1989 and was taken off the highway and bridge data bank in 2003. The structure has been the focus of literary works and also attempts to refurbish it for future use, all of whom had failed to date. This attempt came because of its historic significance and popularity among pontists and (bridge) photographers and locals familiar with the bridge and its enriched history. Since 2019, a facebook page on Relocating the Kern Bridge has been in use, where people can share ideas on how to reuse the bowstring arch structure, as well as photos, stories and the like. A link to the page is at the end of the article.

The Bridgehunter’s Chronicles will keep you posted on the latest with the Kern Bridge and its future.

Links:

Bridge information:

bridgehunter.com: http://bridgehunter.com/mn/blue-earth/bh36213/

historicbridges.org: https://historicbridges.org/bridges/browser/?bridgebrowser=minnesota/kern/

 

Bridge Removal Project:

-MPR News: https://www.mprnews.org/story/2020/02/06/cranes-lift-historic-minnesota-bridge-from-its-crumbling-perch

-KEYC TV: https://www.keyc.com/2020/02/07/americas-longest-bowstring-arch-truss-bridge-removed-near-mankato/ 

 

facebook page: https://www.facebook.com/Relocate-and-Restore-the-Historic-Kern-Bowstring-Arch-Bridge-in-Mankato-1257649057723433/?modal=admin_todo_tour

 

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