Longest Bowstring Arch Bridge in the USA Removed

111469-l

bhc newsflyer new

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

 

BHC 10th anniversary logo1

BHC Newsflyer: 22 April, 2019

Nieblungenbrücke in its original form prior to World War II. Photo: WikiCommons

Podcast can be found here: https://soundcloud.com/jason-smith-966247957/bhc-newsflyer-22-april-2019

 

Article on the news stories in detail:

Key motorway bridge in Brazil collapses after a boat collision

Key Missouri River Crossing becomes history

Key Highway crossing in Pennsylvania to be replacedIncludes PENNDOT Bridge Marketing Profile

Nieblungen Bridge in Worms (Germany) to undergo Major makeover- main span to be replaced:Profile on the Bridge via wiki

Historic Bridge in Sonoma County, California to be replaced; trusses to be incorporated into new structure.

A 130-year old champaign bottle found in the rubble of a demolished historic bridge near Naumburg

Historic bridge in Frankfurt barely escapes a bomb in the River Main: Includes information on the Iron Bridge (not Alte Brücke as mentioned) where the bomb was found and detonated- here!

A historic bridge that survived the bombings of World War II in Hamburg to get a facelift and a new location.  Information on the Freihafenelbebrücke under the Bridges of Hamburg here.

And the second longest bowstring arch bridge in the world to be dismantled and stored until a new home is found.  Includes Facebook page on Relocating and Restoring the Kern Bridge

ALSO: Information and Petition to stop President Trump’s plan to shut down the National Register of Historic Places. Deadline is 30 April.

 

bhc-logo-newest1

BHC Pic of the Week Nr. 28

cropped-111461-l.jpg

Our 28th Pic of the Week takes us back to 2007 and this bridge in Minnesota- the Kern Bridge. Located south of Mankato, this 1873 product of Wrought Iron Bridge Company is the longest bowstring arch bridge in the US, with a span of 190 feet. It is the second longest in the world behind the Blackfriar’s Bridge in London, Ontario (Canada). The bridge has been closed since 1990 and has been sitting abandoned ever since. Unless something can be done to rehabilitate the bridge, the structure is on the verge of collapse with a cracked abutment and missing planks according to the latest visit by James Baughn. Currently, there is some collaboration behind the bridge’s future in terms of restoring it for reuse. Yet lack of funding and the will to restore it is still imminent We’re looking for some ideas as to what to do with this structure. Does anybody have any ideas?

 

bhc eric delony

Dodd Ford to receive a makeover

Dodd Ford Bridge spanning the Blue Earth River near Amboy, Minnesota. Photo taken by the author in September 2010

Truss bridge to be placed onto concrete stringer with the decking encased. Work scheduled to begin in Summer 2014

It is a beautiful piece of artwork when crossing the Blue Earth River, as seen in the video produced five years ago. It was built by a bridge engineer who immigrated to the United States from Germany and later went into politics. Despite being closed to traffic for five years and being threatened with demolition, it is a local landmark that is nationally significant with a unique appearance.

The Dodd Ford Bridge is now getting the rehabilitation it deserves. Residents living in and around Amboy, located south of Mankato in Blue Earth County, Minnesota have found a way to save the bridge by getting the support needed from the county as well as agencies on the state and national levels, with two goals in mind: saving the bridge and reopening it to traffic again. Both of them will be realized later on this year.

Workers will place the truss superstructure onto a modern concrete stringer bridge, encasing the lower chord with new decking, and adding new ornamental railings in the process. New paint and other repairs will be in the mix as well. The cost for the whole project: $1.3 million, $130,000 of which had already been allotted by the county for the project with the rest being provided by grants and other financial resources. Construction on this bridge is set to begin this summer, and while it is unknown how long the project will last, once the bridge is reopen to traffic, farmers and tourists alike will at last have the opportunity to cross the structure again. The 150-foot long bridge had been closed to heavy vehicles for over two decades and to all but pedestrian traffic since 2009. Upon inspection by both official contractors as well as private sources, the truss bridge itself was in pristine condition, leading to the question of “…why it was closed to begin with,” according to one source.

The Dodd Ford Bridge was built as a Camelback through truss bridge in 1901 by Lawrence H. Johnson, a bridge engineer who had once presided over the operations of Hennepin Bridge Company but built this structure as an independent contractor. Born in northern Germany (with sources pointing to Flensburg in Schleswig-Holstein) in 1862, Johnson emigrated to the US in 1875 and eventually to Minnesota in 1884, when he started his bridge-building business. He served in the Minnesota legislature, representing the Republican party and Hennepin County from 1901 to 1910, during which he was also president of the Hennepin Bridge Company in Minneapolis.  He died in 1947 but it is unknown where he was interred.  Johnson built numerous bridges in Minnesota, both as an independent contractor as well as during his days as president at Hennepin, but the Dodd Ford Bridge, as well as the Old Barn Resort Bridge near Preston in Fillmore County are the only two structure left with his name on there (surprisingly enough, the latter has been closed to traffic since 2010 and is also the subject of efforts to reopen it to traffic again).

If the bridge becomes encased with concrete decking, it will not be the first one that will receive this treatment. Several Minnesota truss bridges have received similar treatments and are still in operation. Most notable ones include the Merriam Street and Washington Avenue Bridges both in Minneapolis. The former consists of one of the spans of the original Broadway Avenue Bridge over the Mississippi River that was relocated to its present site east of the Hennepin Avenue Bridge in 1987, spanning the mighty river’s small channel. The latter spans the railroad tracks in downtown and was encased in 2001, with the trusses widened to accommodate traffic. While questions have been raised regarding the historic integrity of the bridge being compromised through this type of rehabilitation, many people have embraced this claiming it’s “…better that than to have no historic truss bridge at all.”

Compromise or not, the Dodd Ford Bridge is about to receive new life again, thanks to the efforts undertaken to save this bridge from becoming scrap metal. With 50% of the number of historic bridges gone across the country and Blue Earth County only having a handful left, including the Kern Bowstring Arch Bridge, people are taking a stand to preserve what is left of infrastructural history in America. The Dodd Ford Bridge not only represents that, but also a bridge that was built by an immigrant from a country that produced many bridge engineers of their time to build great infrastructures. And like Germany, the US and with regards to the Dodd Ford Bridge, the locals are fighting to save the unique few that are left for the next generations to enjoy.

Author’s Note: More information is needed about Lawrence H. Johnson’s life as a bridge builder and politician, as well as a confirmation of where he was born and where his tomb is located. If you have any information, please send it to the Chronicles at: flensburg.bridgehunter.av@googlemail.com. Information will be added once it’s received.

Click onto the links to learn more about the bridge and Lawrence Johnson, including the photos taken by the author during his visit in 2010 as well as Nathan Holth during his visit last year.