The Bridges along the Baltic-North Sea Canal Part II: The Rendsburg High Bridge

Rendsburg High Bridge in Rendsburg, Germany Photo taken by the author in April 2011

Information:

Location: Baltic-North Sea Canal at Rendsburg, Schleswig-Holstein, Germany

Description: Main span: Cantilever Warren through truss with transporter (main span), steel trestle approach span (south) and loop approach (north)

Length: 7 km (total) Of which: 2468 main span; loop approach 4.5 km

Built: 1913 by Friedrich Voss and  C.H. Jocho of Dortmund

Travelling north to Flensburg on the Schleswig-Holstein-Express (the SHE) one evening in May 2010, I was chatting with four passengers heading home to the Rum capital of the world, talking about break-ups, broken marriages and partners cheating on them, when we suddenly found ourselves taking off from the ground. To think that most of the German state is flat consists of mainly farmland and coastal areas, to go from travelling on the ground to travelling in the air in a matter of seconds is like Eliott and E.T. flying in the air by bike. Yet the sound of metal to metal contact, especially when going over the steel towers revealed that whatever we were crossing was huge, the spectacular view of the lights of the town below and the body of water covered in emerald green lights was gorgeous.  After going through the steel truss mechanism, we made our descent in a curly-Q fashion before touching the ground and stopping at our next station. Our conversation had stopped in favor of the structure’s admiration, a sign that homage needed to be paid to a gigantic symbol that bridges the past with the present, the lover on one place with one in the other, and the impossible with the reality.

Especially the last one is what describes the Rendsburg High Bridge, spanning the Baltic-North Sea Canal in Rendsburg, located between Hamburg and Flensburg. The bridge was the masterpiece of Friedrich Voss, who had built two other structures along the Grand Canal at Hochdonn and Kiel as well as numerous others in the northern half of the country, concluding the two-span arch bridge at Friedrichstadt. It took 1.5 years to build the main attraction along the canal, which after 104 years, it still serves as the anchor that makes the Grand Canal and Rendsburg the place to visit.  What Voss did with the bridge was unthinkable, impossible and even insane in the eyes of many locals during that time. While steel trestles and a through truss design were his signatures for long-span structures like the aforementioned bridges, Voss needed a main span that would carry both horse and buggy (and later cars) as well as rail traffic. Henceforth as one of the feats, Voss chose the cantilever Warren span, whose roadway would serve rail traffic connecting Hamburg and Neumünster to the south and Flensburg and Scandanavia to the north. Hanging from the main span is the transporter span, which even today carries cars, bikes and pedestrians across the canal between Rendsburg and Aldorf. The transporter operates four times an hour in both directions during the day and takes 4-5 minutes to cross, half as long as when crossing the entire bridge via SHE.

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Even more unique is the north approach. Already in existence was the train station for it served rail traffic between Kiel and Husum, the problem came with how the approach span should descend from 50 meters above water to just over zero. This was where Voss referred to the history books and chose the loop approach. Using the Hastings Spiral Bridge as reference, the loop approach provides travelers with an opportunity to gradually glide down from the bridge, making a circle of 360°. The 1895 bridge over the Mississippi River was the first bridge to feature this loop approach for engineers and bridge builders at Wisconsin Bridge and Iron Works had the problem of the bridge extending into Hasting’s business district, which already had numerous buildings and traffic at that time. Therefore, the south approach consisted of the loop approach, thus encouraging cars to glide down into the city center like a marble.

The problem was similar with the north approach, as it consisted of much of Rendsburg’s city center and housing area, combined with remnants of the old canal and the harbor area connected with the new canal. Therefore, Voss and his men devised a plan where a loop approach would feature first a series of steel trestles at the height of between 40 and 50 meters above water level, followed by earthen berms with concrete arch spans crossing main streets,  after the descent of 40 meters. A Warren deck truss span crosses the rail line as it approaches the end of the loop. The total length of this loop approach alone is 4.5 km. The area the loop encircles consists of housing and therefore was later named Schleife.

On 1 October, 1913, after 1.5 years of work, Voss and 350 of his men from the bridge-building firm C.H. Jucho of Dortmund completed the work, and the bridge was open to traffic. The bridge and transporter complex has operated almost unaltered ever since, sustaining minimal damage in World War II. The bridge was rehabilitated with rust protectant being added to the steel bridge between 1993 and 2012. The rail line was electrified in 1995, which resulted in the portal and strut bracings of the through truss span being lifted. Instead of the two-rhombus portal bracing, the main span now had A-frame portals, high enough for trains to pass through. Sadly though, the transporter portion of the bridge is being replaced even as this article is being reproduced for this page. On 8 January 2016, the transporter collided with a ship as it was passing underneath the bridge. The boat operator and another passenger were injured in the wreck. After thorough investigations by the local authorities and the Ministry of Transportation, it was concluded that the transporter could not be salvaged and was therefore removed from the bridge. A replacement replicating the original transporter is currently being constructed and should be installed by 2017/18.

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I had a chance to visit the bridge again in 2011, this time filming the crossing of the bridge and its transporter, but also following the path of the bridge from the start of the loop approach on the ground to the main span. While I never got a chance to see the Spiral Bridge as it was torn down in 1951, the Rendsburg High Bridge is nothing anyone has ever seen before. It is amazing just to be in a small suburb that is encircled by the loop approach, listening to trains cross it on an hourly basis. Its tall and towering trestles cannot be missed when travelling through Rendsburg. But the main span is just as amazing, for it has a total height of 68 meters, visible from 20 kilometers, making it one of the tallest structures along the Grand Canal.  But I also noticed that the bridge with its wonderful work of art has not yet been recognized on the national and international scale. With the Vizcaya Bridge being nominated as a UNESCO World Heritage Site in 2013, the Firth of Forth Bridge scheduled to be nominated in 2015, the Rendsburg High Bridge Complex should be considered another UNESCO site as well because of the engineering feats that Voss accomplished in building this superstructure but also because the bridge still functions as a normal crossing of its kind today, just like it did when it opened to traffic in 1913. This is something that has made Rendsburg famous and makes it one of the wonderful works of art in Schleswig-Holstein, Germany and central Europe. Already it was given the Historische Wahrzeichen der Ingenieurbaukunst in Deutschland Award (Historic Recognition of the Works of Engineering in Germany) in 2013, on its 100th birthday. Chances are, more accolades will follow for this iron lady, whose total length of 7 kilometers (2,400 m main span) still makes it the longest railway bridge in Germany.

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To close this documentary about this bridge, the third and most important part of the Tour along the Grand Canal, there is a saying that applies to any bridge enthusiast. You are never a true pontist unless you visit at least a couple key engineering works. In my book, one should really pay homage to the Rendsburg High Bridge. It is an engineering work of achievement that is underrated and something that awes every engineer to this day. Every engineer has his creative talents, which Voss had when building this bridge. It has withstood the test of time and is still a work of art one should see, when visiting Germany. It is hoped that it will one day be a UNESCO site. It will eventually for it deserves this honor.

Author’s note:

You can view the photos of the Rendsburg High Bridge via facebook site. Click here to have a look at every aspect photographed during my visit in 2011.

Some videos of the bridge can be viewed below as well:

And some links to provide you with some more information on the Rendsburg High Bridge:

http://www.rendsburger-hochbruecke.de/

http://www.move-team.de/artikel/rendsburg.html

This bridge was used as a logo for the Bridgehunter’s Chronicles from 2011 until its retirement and replacement with the current logo in 2015 using another Schleswig-Holstein bridge in its place, the Fehmarn Bridge. This is what the Rendsburg variant looked like.

 

 

 

 

 

The location of the Rendsburg High Bridge and the train station can be found on the map here:

 

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Rome Bridge Gone!

Photos taken by James Baughn

ROME/SPRINGFIELD, MO-  While flooding has taken its toll on many bridges in the region, another bridge located in Douglas County, Missouri met its end yesterday. Yet the removal was planned. The Rome Bridge was a two-span Pratt through truss bridge featuring a four-rhombus Howe Lattice portal bracings with curved ankle braces. The 102-year old bridge was the product of the Kansas City Bridge Company but was built under the direction of J.H. Murray and Company. Upon completion in 1913, the bridge was 201 feet long (two 100-foot truss spans) and 15 feet wide.

Yet despite its historic significance and its proximity to a nearby park, talks had been underway to replace the bridge for three years because of structural concerns and its age. Attempts were undertaken to convince county officials and a preservation group to take a stand to stop the plans for replacement, part of that was in connection with the successes with the Riverside Bridge, which had been fixed and reopened prior to the unveiling of the plans to tear this bridge down. Unfortunately, to the dismay to many preservationists and locals, the ideas fell on deaf ears as county officials went ahead with the replacement project. With the truss bridge now reduced to a pile of scrap metal, a replacement bridge will take its place, most likely being scheduled for opening to traffic by the end of the year at the earliest. But memories of the bridge will remain and a facebook site (which you can click here) features a gallery of photos and videos of the bridge when it was still in service. There are a pair of videos below, which takes you across the bridge- that is before it was taken down yesterday.

 

 

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Book of the Month: The Colorado Street Bridge in Pasedena, California

Bridge Color Dusks
Lampposts of the Colorado Street Bridge in Pasadena. Photos courtesy of Tavo Olmos

Pasadena, California: with 138,540 inhabitants and a suburb of Los Angeles, the city is loaded with glamor and glitter, as the rich and famous make their homes there. Streets are lined with tall palm trees and loaded with cars. And there are famous landmarks that make the city the place to see, like the Pasadena Playhouse, the Ambassador Auditorium, Bungalow Heaven, the Rose Bowl (and the site of the Tournament of Roses Parade that takes place on New Year’s Day), and of course, the Colorado Street High Bridge.
While I have yet to see the bridge, along with the other structures in the City of Angels, I was approached by the publisher about doing a review of a book written by author Tavo Olmos on this particular bridge. Looking at the copy received by the folks at Pasadena, I am pleased to inform you that the wish is granted. This part will look at the book, while the next part will feature the interview by the author himself.
The Colorado Street Bridge was one of the most important works of Dr. John Alexander Low Waddell of the Kansas City-based bridge building firm Waddell and Harrington.  Before its completion in 1913, Waddell had already garner numerous accolades both in the United States as well as Europe and Asia, due to numerous bridges built during his 20-year career, plus numerous bridge design patents, like the Waddell truss, a subdivided form of the Kingpost truss bridge where there are only two of the through truss type and over a dozen pony truss types left in the country.  Waddell designed the arch bridge to make it aesthetically appealing to the city, yet the contract for actually building the bridge went to John Drake Mercereau, for cost-cutting purposes. The nearly 1428-foot long bridge was completed in over a year’s time in December 1913. Waddell would later build many gigantic structures over the next 25 years until his death in 1938.
Because of wear and tear and the fact that it was becoming functionally obsolete (because of the increase in the number and size of traffic), plans were in the making to replace the Colorado Street Bridge, starting with a freeway bridge in 1953 (known as the Arroyo Seco Viaduct), mimicking the design of the bridge. The bridge was closed to traffic in 1989, but on both occasions, citizens of Pasadena petitioned the city to find ways to preserve and restore the structure. After two years of politicking and campaigning, the city council in 1991 passed a resolution, providing millions of dollars in funding to restore the bridge, a process that took a year and a half to complete, from July 1991 until it finally opened to traffic in December 1993.
For those who have little knowledge of how an arch bridge like the Colorado Street Bridge can be restored, this book provides you with the restoration process described in pictures. During the restoration process, Tavo Olmos photographed the entire restoration process, from the start of the project, where the roadway was removed, to the time where the arches were retrofitted to increase its sturdiness and make them earthquake-resistant, to the completed work of widening the decking and adding the ornamental lighting.  Much of them were published in the book, published last year as part of the celebrations of the bridge’s 100th birthday. The book features some background information about the bridge and its dimensions, as well as its designer and bridge builder, before looking at the restoration process in pictures and the notes he took that were added in the book. Yet despite the fact that Olmos is a photographer, his book does not just feature photos of the entire restoration process. Articles written by people associated with the bridge and the project itself, which includes Claire Bogaard, the wife of the city mayor Bill Bogaard, members of the city public works, the city engineer and those involved with the project directly.  These articles were written in simple terms, describing the restoration process to the public in 2-4 pages that are easy to read and understand, if the reader is interested in knowing more about the restoration process.
Sometimes less is more and simplicity can speak more volumes than complication ever can offer. With the Colorado Street Bridge project, Olmos did not need to describe the process beyond what was shown in the pictures and notes supporting them, giving the reader the visualization of how bridge restoration works both in general if arch bridges are involved, but also in such a tall structure like Pasadena’s beloved icon. For preservationists and interested readers wanting to know how a bridge can be restored, it is highly recommended to buy/order this book, look at the pictures and read the comments from those behind the restoration process.
At 101 years of age, the bridge still lives on, both in pictures as well as in its original form. It is hoped that this book will provide a guidance where the bridge is an example of other bridges of its kind, both big and small, that can be restored if people have the efforts and manpower to conduct it. If not, the book has some history behind the bridge and how it became an integral part of Pasadena’s history.

Bird’s eye of the bridge at night.

 

Author’s Note: Tavo Olmos, whose photos were used for this article, was asked a few questions about the book by the Chronicles. The information from the interview is to follow. 

Book info:

Olmos, Tavo. The Colorado Street Bridge: Restoration Project Photographs 1991-1993  Pasadena, CA: Balcony Press, 2013