Four-span Camelback through truss reopened to traffic after a two-year rehabilitation program.
BLOOMINGTON, MINNESOTA (USA)- The people of the City of Bloomington wanted their bridge back. People attached to the bridge wanted it back. Developers of the Mall of America Expansion Project wanted their bridge back. Now, after a two-year project and being closed down to all traffic for 14 years, the Long Meadow Bridge, spanning the lake bearing its name at the site of Old Cedar Avenue, is back. Since last weekend, the 860-foot long bridge, built by the Illinois Steel Company in 1920, has been opened to cyclists and pedestrians, thus restoring the key link between Bloomington and Burnsville. The project was part of the plan to provide better access to the Mall of America, where over $9 million was spent on the project. Upon first observations of the bridge in 2011, the question remained just how this mammoth of a task was to be completed. Here is a short summary of how it was done:
The Bridge before the Project (Photos taken by the author in 2011)
The lower stringers were removed from the bridge, thus leaving the truss superstructure as a skeleton. They were replaced with new, modern ones with thick I-beam frames that would withstand the extremeties. The original ones were so corroded that they could not be salvaged. In addition, the piers and footing of the bridge were replaced. This was done by lifting the bridge span onto towered scaffolding, allowing the workers to replace the gusset plates, lower beams and the piers themselves. All of the gusset plates and most of the piers and abutments were replaced, thus giving the bottom half of the bridge a new modern form. Once the bridge spans were placed back onto the newly built piers, new concrete decking was added, as well as new coat of paint on the trusses, and finally new railings and lighting. A photo gallery of the whole project, courtesy of the City of Bloomington, can be seen in detail by clicking here. However, a few pics from the gallery were taken out to show a preview of how the project was completed.
With the bridge open to traffic, people will once again have the opportunity to use a historic structure for their own use- observing wildlife, walking with family, biking or even shopping if they wish to visit the Mall of America. It has revitalized the historic Cedar Avenue Route, which includes the Minnesota River crossing. But more importantly, the project shows that with a lot of political effort, combined with financial resources and technical know-how, even the most difficult issues can be resolved without having to scrap a piece of history to waste. Such problems on other bridges would have warranted their demolition and replacement. However, the city of Bloomington, the state of Minnesota, and many people attached to the bridge stuck together to the very end, withstanding all possible opposition and hesitancy, to make sure that the bridge is brought back to it rightful owners, which is theirs. With this mammoth project behind them, comes the first accolades. Apart from its listing on the National Register, one of its first awards coming up is the Ammann Awards for Best Example of a Preserved Historic Bridge. It has just become the first candidate. Many more will come, but you have a chance to vote on it come December. Stay tuned. 🙂
Inspite the number of historic bridges being demolished or wiped away because of natural disasters, there are a few bright spots to consider. The Long Meadow Bridge in Bloomington, MN is one of them. Spanning the Long Meadow Lake arm of the Minnesota carrying Old Cedar Avenue, this 1920 structure, featuring five riveted Parker through truss spans with M-frame portal bracings has had a long history in itself. The current structure is the second crossing at this site where a major thoroughway used to exist. Originally connecting Minneapolis with the southern suburbs of Apple Valley, Bloomington and other smaller towns, Cedar Avenue used to be a major throughway back in the times where freeways did not even exist, with three major bridges carrying the major highway- Tenth Avenue Bridge over the Mississippi River in Minneapolis, the Minnesota River Swing Bridge, and this one, located just to the north of the Swing Bridge. The Swing Bridge and this bridge were built at the same time in 1890, with the latter featuring trestle approaches a possibily a swing span as its main span. Evidence of this can be found in pictures, as shown by John Weeks, who has visited this bridge many times (click here for pictures). Yet for some reason, be it lack of boat traffic or flooding, the swing span and trestles at Long Meadow Lake were replaced with a series of fixed spans in 1920, which has not been altered since then. Both bridges served traffic crossing the island and providing access between the southern suburbs, the International Airport and downtown Minneapolis. This was until the bridges were rendered useless with the construction of the tied arch bridges in 1979, and Cedar Avenue (which had become Hwy. 77 in 1949) was rerouted to this freeway bridge. Sections of Cedar Avenue were eventually either rerouted or cut off with the construction of the Hwy. 62 Crosstown and I-494 Freeways, while the swing span over the Minnesota River was torn down shortly after the opening of the Hwy. 77 Bridge in 1980. Yet the Long Meadow Lake Bridge continued to serve traffic until it was deemed unsafe and was closed to cars in 1993 and later to all pedestrians and cyclists in 2002, fencing it off and removing 30 feet of decking on each side of the bridge. Despite the construction of a pedestrian bridge south of the bridge over the Minnesota River, there has not been any access to the airport, Mall of America (built in 1991) and the rest of the Twin Cities from the south.
But that is about to change!
For years, officials from several aspects of government, including the City of Bloomington, the National Park Service, the National Wildlife Preserve, and the state government have been wrestling over the future of the bridge, with the majority of the Bloomington City Council wanting to see the bridge torn down and replaced with a berm or a new crossing, and the federal agencies wanting the bridge to be kept as it is part of the national wildlife refuge which includes 35 miles of wildlife along the Minnesota River starting at Ft. Snelling State Park south of St.Paul. With the fight lingering, it seemed that there would be no end in site, and the bridge would eventually become part of naturing, decaying slowly but surely.
But recent decisions made this month has given the Long Meadow Bridge new life. This is thanks to Representative Ann Lenczewski, DFL-Bloomington, who had been fighting to provide funding for the reconstruction of the structure. How she successfully accomplish this task though required some clever thinking and some support from House Speaker Paul Thissen, DFL- Minneapolis and Governor Mark Dayton, DFL. The scoop: The Mall of America. Built in 1991 as the largest mall in the country at that time, officials wanted to expand the facility to include more shopping, lodging, gambling and parking possibilities, a project worth over $1.5 billion. State legislators on 22 May agreed on a proposal to provide $250 million towards the project and additional $9 million for the bridge. There was a catch though, which was no cent would be spent unless the City of Bloomington agreed to reconstruct the bridge. While the city breathed a sign a relief that funding is available and were very forthcoming on the proposal, they had another catch to the plan: officials cannot tear down and replace the bridge!
10 days ago, the Long Meadow Bridge was listed on the National Register of Historic Places because of its association with the type of bridge used during the 1920s, when the era of standardized truss bridges with riveted connections and heavy steel to accomodate traffic was in full motion. It was also part of the history of the Old Cedar Avenue and for many residents, the history of Bloomington itself. With its listing on the National Register of Historic Places, the bridge will receive new life as a pedestrian and bicycle bridge as it will undergo extensive rennovation to reopen the important link between the southern suburbs and the airport and the Twin Cities.
How this bridge will be rehabilitated remains unclear. Judging by the author’s visit in 2011, combined with inspections done by the Minnesota Dept. of Transportation, the major problems contractors will be facing will be the decking portion of the bridge, as many floorbeams and cross beams have corroded away to a point of irreparability and will have to be replaced. Yet if lessons are learned from three other examples, the Merriam Street, Washington Avenue and 4th Avenue Bridges, it is most likely that the Long Meadow Bridge may be set into a concrete bridge, which will function as the main bridge with the truss bridge being the ornament. On the other hand, if wood decking is needed, than new steel beams will be needed to support the deck and to function as a standing structure. The superstructure itself appears to be in great condition despite the rust but will most likely be repainted so that it is protected against weather extremities. While it is unclear what the condition of the piers are, learning the lessons from the collapse of a railroad bridge in Calgary, Alberta (Canada) because of flooding, it is most likely that they will have to be inspected for scouring and be reinforced and or replaced. And lastly, the old highway will need to be cleared of downed trees and other vegetation which had taken over since 2002. The road does not necessarily need to be replaced as it still retains its historic character, yet some touch-ups will be needed to ensure that safety and aesthetics go together like bread and butter.
The hill will be steep to climb regarding rehabilitating the bridge, but one can use $9 million wisely to make the bridge what it was before it was closed to all traffic and return the bridge to its original form- as a piece of history connecting three key points. Thanks to Ann Lenczewski, DFL-Bloomington, the wish of restoring the bridge and opening it up again will become a reality. The Bridgehunter’s Chronicles will keep you posted on the latest on this bridge.
You can see a gallery with photos taken of the bridge by the author with some details and explanations here.