Our next Pic of the Week tribute to James Baughn takes us out of Missouri and to neighboring Iowa. Located southeast of Mount Pleasant, the county seat of Henry County in the southeastern corner of the state is the Oakland Mills Truss Bridge. Spanning the Skunk River west of Franklin Avenue, the bridge was built in 1876 by the Missouri Valley Bridge and Iron Company which was based in Leavenworth, Kansas. It’s one of a handful of combination spans left in the State of Iowa, featuring (from north to south) a Pratt half-hip, a wooden trestle, two Pratt through trusses and a four-panel Pratt pony. Sources indicated the trestle may have replaced a third Pratt through truss span but it hasn’t been confirmed in the bridge records. The entire truss system features pinned connections while the southern through truss span has ornamental portal bracings. The bridge was converted into a park in the 1970s and has been on the National Register of Historic Places for almost a half century.
The Missouri Valley was one of a few companies that lasted well into the modern era, having been formed in 1874. It was dissolved in 1975 after a fire destroyed the shop at its original home in Leavenworth. It was reorganized shortly afterwards but it left the bridge building business altogether. The Kansas State Historical Society did an extensive write-up on the company’s history, which you can view here. In the 101 years of business, the company constructed a wide variety of bridges, ranging from single and multiple span truss bridges to cantilever spans. It even constructed a concrete pony truss in New Mexico in 1915, one of two of its kind left in the US. 80% of all bridges built by Missouri Valley were towards the south central part of the country, concentrating on Missouri, Kansas, Oklahoma, Arkansas and Texas. Only two bridges in Iowa were reportedly built by this company, yet the Oakland Mills is the only one left in the state that’s still standing.
And it is also one of the most popular bridges to visit among bridge lovers, tourists and historians as one can make a picnic on the bridge and devote time to spending it on the bridge. Even at night, one is greeted with Christmas lighting as was my case when I visited the bridge in 2011 in the evening, on the eve of the Historic Bridge Weekend in St. Louis. But James’ pic was taken at the time of the Historic Bridge Weekend in Iowa- two years later! In my opinion, the daytime shot was better than all the shots I took because of the lighting.
Still, who’s competing? 🙂 We both agree: The bridge is worth stopping for a visit, no matter for what purpose. And if properly and regularly maintained, the bridge will be around for generations to come. ❤ 🙂
And now, before we announce the winners of the 2020 Bridgehunter Awards, I have a few favorites that I hand-picked that deserve international recognition. 2020 was a year like no other. Apart from head-scratcher stories of bridges being torn down, we had an innummeral number of natural disasters that were impossible to follow, especially when it came to bridge casualties. We had some bonehead stories of people downing bridges with their weight that was 10 times as much as what the limit was and therefore they were given the Timmy for that (click on the link that will lead you to the picture and the reason behind it.) But despite this we also had a wide selection of success stories in connection with historic bridge preservation. This include two rare historic bridges that had long since disappeared but have now reappeared with bright futures ahead of them. It also include the in-kind reconstruction of historic bridges, yet most importantly, they also include historic bridges that were discovered and we had never heard of before- until last year.
And so with that in mind, I have some personal favorites that deserve international recognition- both in the US as well as international- awarded in six categories, beginning with the first one:
Best example of reused bridge:
The Castlewood Thacher Truss Bridge in South Dakota:
One of three hybrid Thacher through truss bridges left in the US, the bridge used to span the Big Sioux River near Castlewood until it disappeared from the radar after 1990. Many pontists, including myself, looked for it for three decades until my cousin, Jennifer Heath, found it at the Threshing Grounds in Twin Brooks. Apparently the product of the King Bridge Company, built in 1894, was relocated to this site in 1998 and restored for car use, in-kind. Still being used but we’re still scratching our heads as to how it managed to disappear from our radar for a very long time…..
Built in 1866, this bridge was unique for its arch design. It was destroyed by floods in 2015 but it took five years of painstaking efforts to put the bridge back together again, finding and matching each stone and reinforcing it with concrete to restore it like it was before the tragedy. Putting it back together again like a puzzle will definitely make for a puzzle game using this unique bridge as an example. Stay tuned.
While it has not been opened yet for the construction of the South Park Gardens is progressing, this four-span arch bridge connecting the Park with the Castle Complex was completely restored after 2.5 years of rebuilding the 17th Century structure which had been abandoned for four decades. Keeping the outer arches, the bridge was rebuilt using a skeletal structure that was later covered with concrete. The stones from the original bridge was used as a façade. When open to the public in the spring, one will see the bridge that looks like the original but has a function where people can cross it. And with the skeleton, it will be around for a very long time.
This one definitely deserves a whole box of tomatoes. Instead of rehabilitating the truss bridge and repurposing it for bike and public transportation use, designers unveiled a new bridge that tries to mimic the old span but is too futuristic. Watch the video and see for yourself. My take: Better to build a futuristic span, scrap the historic icon and get it over with.
Demolishing the Pilchowicki Bridge in Poland for a Motion Picture Film-
Paramount Pictures and Tom Cruz should both be ashamed of themselves. As part of a scene in the film, Mission Impossible, this historic bridge, spanning a lake, was supposed to be blown up, then rebuilt mimicking the original structure. The bridge had served a railroad and spans a lake. The plan was tabled after a huge international cry to save the structure. Nevertheless, the thwarted plan shows that America has long been famous for: Using historic places for their purpose then redo it without thinking about the historic value that was lost in the process.
A one of a kind Thacher pony truss, this bridge went from being a swing bridge crossing connecting East and West Lake Okoboji, to a Little Sioux River crossing that was eventually washed out by flooding in 2011, to the storage bin, and now, to its new home- Parks Marina on East Lake Okoboji. The owner had one big heart to salvage it. Plus it was in pristine condition when it was relocated to its now fourth home. A real winner.
Dömitz Railroad Bridge between Lower Saxony and Mecklenburg-Pommerania in Germany-
World War II had a lasting after-effect on Germany’s infrastructure as hundreds of thousands of historic bridges were destroyed, either through bombs or through Hitler’s policies of destroying every single crossing to slow the advancement of the Allied Troops. Yet the Dömitz Railroad Bridge, spanning the River Elbe, represents a rare example of a bridge that survived not only the effects of WWII, but also the East-West division that followed, as the Mecklenburg side was completely removed to keep people from fleeing to Lower Saxony. All that remains are the structures on the Lower Saxony side- preserved as a monument symbolizing the two wars and the division that was lasting for almost a half century before 1990.
Forest Fires along the West Coast- 2020 was the year of disasters in a literal sense of the word. Apart from the Covid-19 pandemic, which brought the world to a near standstill, 2020 was the year where records were smashed for natural disasters, including hurricanes and in particular- forest fires. While 20% of the US battled one hurricane after another, 70% of the western half of the country, ranging from the West Coast all the way to Montana, Colorado, Wyoming and the Dakotas dealt with record-setting forest fires, caused by drought, record-setting heatwaves and high winds. Hardest hit area was in California, Washington and even Oregon. Covered bridges and other historic structures took a massive hit, though some survived the blazes miraculously. And even some that did survive, presented some frightening photo scenes that symbolizes the dire need to act on climate change and global warming before our Earth becomes the next Genesis in Star Trek.
Demolition of the Historic Millbrook Bridge in Illinois-
Inaction has consequences. Indifference has even more painful consequences. Instead of fixing a crumbling pier that could have left the 123-year old, three-span through truss bridge in tact, Kendall County and the Village of Millbrook saw dollar signs in their eyes and went ahead with demolishing the entire structure for $476,000, coming out of- you guessed it- our taxpayer money. Cheapest way but at our expense anyway- duh!
Planned Demolition of the Bridges of Westchester County, New York-
While Kendall County succeeded in senselessly tearing down the last truss bridge in the county, Westchester County is planning on tearing down its remaining through truss bridges, even though the contract has not been let out just yet. The bridges have been abandoned for quite some time but they are all in great shape and would make for pedestrian and bike crossings if money was spent to rehabilitate and repurpose them. Refer to the examples of the Calhoun and Saginaw County historic bridges in Michigan, as well as those restored in Winneshiek, Fayette, Madison, Johnson, Jones and Linn Counties in Iowa. Calling Julie Bowers and Nels Raynor!
Collapse of Westphalia Bridge due to overweight truck-
To the truck driver who drove a load over the bridge whose weight was four times the weight limit, let alone bring down the 128-year old product of the Kansas City Bridge Company: It’s Timmy time! “One, …. two,….. three! DUH!!!!” The incident happened on August 17th 2020 and the beauty of this is, upon suggesting headache bars for protecting the bridge, county engineers claimed they were a liability. LAME excuse!
Located near the Göhren Viaduct in the vicinity of Burgstädt and Mittweida, this open-spandrel stone arch bridge used to span the Zwickau Mulde and was a key accessory to the fourth tallest viaduct in Saxony. Yet it was not valuable enough to be demolished and replaced during the year. The 124-year old bridge was in good shape and had another 30 years of use left. This one has gotten heads scratching.
Collapse of Bridge in Nova Scotia due to overweight truck-
It is unknown which is more embarrassing: Driving a truck across a 60+ year old truss bridge that is scheduled to be torn down or doing the same and being filmed at the same time. In any case, the driver got the biggest embarrassment in addition to getting the Timmy in French: “Un,…. deux,…… toi! DUH!!!” The incident happened on July 8th.
Consisting of vine bridges dating back hundreds of years, this area has become a celebrity since its discovery early last year. People in different fields of work from engineers to natural scientists are working to figure out how these vined bridges were created and how they have maintained themselves without having been altered by mankind. This region is one of the World’s Top Wonders that should be visited, regardless whether you are a pontist or a natural scientist.
This structure deserves special recognition not only because it turned 125 years old in 2020. The bridge is the longest of its kind on the South American continent and it took eight years to build. There’s an interesting story behind this bridge that is worth the read…..
For bridge tours on the international front, I would recommend the bridges of Schwerin. It features seven iron bridges, three unique modern bridges, a wooden truss span, a former swing span and a multiple span arch bridge that is as old as the castle itself, Schwerin’s centerpiece and also home of the state parliament. This was a big steal for the author as the day trip was worth it.
Geoff Hobbs brought the bridge to the attention of the pontist community in July 2020, only to find that the bridge belonged to a mansion that has a unique history. As a bonus, the structure is still standing as with the now derelict mansion.
The Bridges of Jefferson Proving Grounds in Indiana-
The Proving Grounds used to be a military base that covered sections of four counties in Indiana. The place is loaded with history, as not only many buildings have remained largely in tact but also the Grounds’ dozen bridges or so. Satolli Glassmeyer provided us with a tour of the area and you can find it in this film.
Now that the favorites have been announced and awarded, it is now the voter’s turn to select their winners, featured in nine categories of the 2020 Bridgehunter Awards. And for that, we will go right, this way…… =>
One will find this one anywhere. Even on the backroads like this one: a single span truss span spanning Soldier River just south of Iowa Hwy. 141 in Crawford County. The bridge was erected here in 1957 to replace a span destroyed during the great flood of 1945. At 90 feet, one would think a through truss span could have fit here. Yet the span is a pony truss and it was put together in layers and put together with bolts. A set of Tinker Toys that was put together easily with the purpose of ensuring even the heaviest vehicles- in this case, farm equipment like tractors- would be allowed to cross it. One has to assume that it was imported somewhere where it had a purpose.
And it was. This span is an example of a Bailey Truss bridge. And even though one can find them here and there, in the farmlands of Iowa to the steep hills of central Saxony, even to the far east, such as India, Australia and New Zealand. Bailey Trusses were unique because all they require is a few metal beams and bolts, combined with manpower, and the bridge is put together in an instant. Bailey Trusses were the works of a brillant engineer and and without his expertise, it would not have won World War II. As Field Marshal Bernard L. Montgomery, the British commander, once said. ”It was the best thing in that line we ever had; without the Bailey Bridge we should not have won the war.”
Bailey was born on 15 September, 1901 in Rotherham in Yorkshire. He obtained a degree in Civil Engineering at the University of Sheffield in 1923 and was a civil servant in the War Department when the war broke out in 1939. The concept of the Bailey Truss was developed in 1936, when Bailey scribbled the design on the back of an envelope. His idea was that prefabricated sections that were interchangable could be deployed to the war front and, with steel pins, soldiers could construct the span, which would be anchored on one side and connected on the other side by the use of force. No heavy equipment would be needed to construct a temporary span, and the parts could be transported with the basic equipment or with man power from one place to another because of their lightweight. Constructing them would be easy for it could be achieved within hours, instead of months. For the war effort, the concept of makeshift bridge construction in the shortest time span possible was of utmost importance in order to win the war.
Firstly ignored, Bailey’s truss design was accepted in 1941 when the Ministry of Supply requested that Bailey construct a full scale span completed by May 1st. The design was successfully tested at the Experimental Bridging Establishment (EBE), in Christchurch, Hampshire, with several parts being provided by Braithwaite & Co. The first prototype was tested in 1941. For early tests, the bridge was laid across a field, about 2 feet (0.61 m) above the ground, and several Mark V tanks were filled with pig iron and stacked upon each other. Another prototype was constructed in 1943 at Stanpit Marsh also in Dorset and was proven successful. That span still exists to this day. After a series of successful trials, the Corps of Royal Engineers introduced the Bailey Truss as a means of construction in 1942 and companies began constructing parts for the Bailey Truss to be transported to the war front.
Use in World War II:
The first Bailey Truss was constructed over Medjerda River near Medjez el Bab in Tunisia on the night of 26 November 1942 by the by 237 Field Company R.E. After learning about the bridge‘s success, both the Canadians and Americans embraced the truss and started their own production to complement that of Britain. Detroit Steel Products Company, the American Elevator Company and the Commercial Shearing and Stamping Company were three of dozens of companies that constructed the Bailey Trusses in the US, which was known as the Portable Panel Bridge. In total, over 600 firms were involved in the making of over 200 miles of bridges using the Bailey design, composing of 500,000 tons, or 700,000 panels of bridging during the war- at the height of the war, the number was at 20,000 panels that were produced and transported. Bailey Trusses were used successfully for transporting military equipment and supplies during the war, including the Normandy and Italy. American troops built over 3200 Bailey Trusses in Italy as they advanced through the Alps into Germany from the south. The longest bridge there was located over the Sangro and had a span of 1200 feet.
Bailey Trusses were also implemented in Germany, when hundreds of key structures were imploded by the Nazis as a way to slowing or stopping the advancement of Allied Troops. This included the bridges along the Rivers Rhine and Main. Canadians were credited for building the longest Bailey Bridge during the war. The Blackfriars Bridge, a 1814 foot long (558 meters) over the River Rhine at Rees, in North Rhine-Westphalia, was the longest span in the world when it opened to traffic on 28 March, 1945.
Even when the war ended on May 7th, 1945, Bailey trusses were in use as temporary crossings while the bridges were either repaired or rebuilt throughout Germany. It had a dual purpose: To help displaced residence get around and to allow for the transportation of necessary goods needed while the country was being rebuilt. Some of them were made permanent, while others, including the major crossings along the Rhine, Main and Elbe were temporary, allowing time for the original structures to be either repaired or rebuilt fully.
After World War II:
When the war was over, there was a surplus of Bailey spans that were available for reuse. This allowed for Americans, British and Canadians alike to reuse them for various projects. Many of them made their way to Iowa, Missouri and Kansas, where counties in the western half of the state needed at least temporary crossings to replace the spans that were destroyed during the floods of 1945 and again in 1952. Some examples still remain in use today. Bailey trusses were used as temporary crossings as bridges were being replaced. In the case of a viaduct in Maryland, the Bailey spans were built prior to the original trestle being replaced with steel trestles.
Large numbers of Bailey truss spans were built in mountainous areas in California where constructing bridges to accomodate travelers was difficult because of the steep, rocky terrain. Some of the spans were part of the ACROW bridge- temporarily built as moveable bridges. The Fore River Bridge and the Lynn Baschule Bridge both in Massachusetts are classic examples of such Bailey Trusses used. Bailey trusses were also used as extra support for the truss bridge, as is the case with the Haiti Island Bridge in New York, which happened in 2007. The span and the truss bridge itself were replaced three years later.
Ontario had the largest number of Bailey truss spans for the years after the war, with the spans being built in and around Toronto in response to damages caused by Hurricane Hazel. The Finch Avenue Bridge is the last of its kind and is now a historic landmark. The Ontario Hydro-Electric Power Commission used some for their office and as walkways. And lastly, Australia built several Bailey bridges, including the world record holder, a 2585-foot (788 meter), two-lane structure over the Derwent River at Hobart, which was constructed in 1975. It served as a temporary structure before the Tasman Bridge was opened to traffic on October 8, 1977. Later, Bailey Truss Bridges were constructed in the far east, including northern Africa, Suriname, and India. Many of them, like the trestle at Wadi el Kuf in Lybia were built by the British during the time of its Empire.
The Legacy of Bailey:
Many scholars and even those who served in the military during WWII believed that the Bailey Truss was the key to mobilizing Allied Troops and securing a victory over Germany and Italy in World War II. As a result, Mr. Bailey received several international accolades for his work. In Britain alone, he was given the Knighthood on 1 January, 1946 and the Commander of the Order of Orange-Nassau exactly two years later. By that time, Bailey was living in Southbourne in Bournemouth and was unaware that he had been knighted until one of the girls at the bank had informed him about it. Bailey would live out his days in Bournemouth, where he died in 1985.
He was considered a quiet man but one where he left a footprint with his truss bridge design, which is still widely used in bridge construction, big and small. And while the successes of World War II fell to the common person who fought for freedom and democracy, Bailey was considered one that played a key role, not only in helping bring an end to the war, but to help rebuild the areas ravaged by war with the Bailey Truss. And when you see a bridge like this one below, one will see how the use of simple parts and tools, combined with the use of manpower could make a work of simple art, something we still see today on our roads.
There are not many memorials dedicated to Bailey, even in Britain, for most of the places where he lived have been razed and replaced with newer housing. Yet the prototype Bailey span at Stanpit Marsh still exists today and his birthplace at 24 Albany Street in Rotherham still stands albeit privately owned. Yet there are some companies that specialize in Bailey trusses, including one in Alabama that bears its name. Bailey trusses were rarely used in films, except one based on the battle of Arnhem, A Bridge Too Far, released in 1977. There, the Bailey Truss Bridge was used in the film.
It is really hoped that a statue and/or additional honors, even a museum would be created honoring Bailey for his life and works. 75 years after the end of the great war, nothing of that sort has been considered. This should be considered, especially as talk of the significance of World War II is disappearing together with the War Generation and the children of the Baby Boom that followed. For historians, bridge enthusiasts, teachers and the public in general, it would produce some great talks about the common man who did great things and became Sir Donald Bailey in the end.
BOONEVILLE, IOWA- It had been touted as one of the longest multiple-span through truss bridges in the state of Iowa. Four spans with a total of over 700 feet. It was one of the last of the quadrangular Warren through truss bridges as well. Now the Booneville Railroad Bridge is all but a memory. According to multiple stories, the last span of the historic railroad bridge came down this past week after having served two different railroad companies for 120 years. The new railroad bridge, a combination concrete and steel plate girder bridge was built alongside the historic railroad bridge and opened to traffic on June 30th of this year.
It was christened the William Duggan Bridge, named after the person who salvaged the railroad when he took over at Iowa Interstate in 1989. The line had once been operated by Chicago, Rock Island and Pacific Railroad from 1900, the year the bridge was built, until its bankruptcy and subsequent liquidation in 1980. The line sat idle for four years before Iowa Interstate took over in 1984, and when Duggan took over five years later, he led efforts in revitalizing the line, which runs through central Iowa from Council Bluffs to the Quad Cities.
The new railroad bridge was needed as the truss bridge had met the end of its functional use. Two of its piers had tilted due to years of flooding and erosion. Others had cracks and were spalling. The new 661 foot multiple-span bridge will carry train traffic of up to 40 mph- double of that of the railroad bridge)- and trains will be able to carry taller and heavier loads. The $3.5 million project was half funded by the federal government through the Federal Railroad Agency through the use of Consolidated Rail Infrastructure and Safety Improvements (CRISI) grant. It took only 17 months to build the new span. It’s part of the 20+ year project to modernize the entire line and will include additional bridge replacements in the future, including three bridges in Davenport- the 3rd and 4th Street Overpasses and the Arsenal Bridge.
The loss of the Booneville Railroad Bridge is a big one for Dallas County, as it is one that people would see when crossing the Raccoon River enroute to West Des Moines. Yet with Des Moines sprawling and the need for transporting goods by rail increasing, the replacement was needed. Whether the bridge would have been used for a pedestrian crossing instead of being scrapped remains open, yet this loss will serve as a reminder that no historic bridge is safe and that action is needed to save the remaining bridges, even those that continue to serve the railroads that travel through Iowa.
Photos and further description of the railroad bridge can be found by clicking here.
The photo was taken from its replacement in August 2011 and provides a cross section of the first two panels, which details the trusses, the connections and the portal bracings. One can see that the truss connections are both pinned (mostly at the top chords) and the riveted (at the bottom chords). The diagonal beams passing through the two panels are characteristic of Whipple trusses built during the last two decades of the 19th Century. The replacement bridge was built in 1996 yet the bridge was left to stand in place because of its historical significance and its listing on the National Register. It’s one of over a dozen truss bridges in Fayette County that has been decommissioned and left standing next to its replacement, thus making the county a real tourist attraction for those interested in finding historic truss bridges.
To see the rest of the bridges in place and plan for your next bridge safari accordingly, click here. 🙂
This week’s Pic of the week takes us to Anamosa, Iowa and to one of the oldest bridges left in the state. The Anamosa Bridge was built in 1878 by the Milwaukee Bridge and Iron Works Company . It was replaced on a new alignment in 1929 but remained open to traffic until 1955. It would be one of the first historic bridges in the state to be converted into a pedestrian crossing, the project was finished in 1975. It was rehabbed once more in 2012 with new decking, replacing the ones damaged by flooding in 2008. The bridge can be seen from the Elm Street crossing as both span the Wapsipinicon River entering the the historic community of 5500 inhabitants, which has a historic state penitentiary on one end, a historic business district on another end and Wapsipinicon State Park on the opposite end of the two.
The bridge has a lot of angles where a person can take a lot of shots, whether it is at sundown, on a foggy night when the amber-blazing lights turn the city into a gold color, or this one, where a group of people were camping. This was taken in August 2011 during the time a full moon was coming out. It was a crystal clear night and a group decided to have a campfire next to the bridge. None of them minded as I was taking some shots with the Pentax. However, I did mind when the prints turned out darker than expected. Hence a photoshop program to lighten it up. Here’s your result.
Have you ever tried camping and/or fishing next to the bridge? If not, it’s one to mark on your bucket list, both as the camper/fisher, as well as the photographer. A good way to enjoy the summer, especially in these times.
This week’s Pic of the Week takes us on a road trip to rural Iowa and to this bridge- out in the middle of nowhere. 😉 The Durrow Road Bridge spans Blue Creek in Linn County. The bridge can be seen from I-380 right before exiting at Urbana. It’s about 10 miles northwest of Cedar Rapids. It’s a Parker through truss bridge, built in the 1920s using standardized truss designs and measures that were introduced by the Iowa State Highway Commission (now Iowa DOT). It was relocated to this spot at the T-intersection with Blue Creek Road in 1949 and has been serving farm traffic ever since. It has been well-kept with new paint and consistent maintenance.
This photo was taken during one of two visits in 2011, together with my bridgehunting colleague Quinn Phelan, who has lived in the area for many years and knows most of the bridges both in Linn County as well as in many parts of east central Iowa. Like it is today here in Saxony and parts of the Midwestern US, it was taken on a beautiful blue sunny day with a slight breeze and lots of greenery in the area.
The Durrow Road Bridge is a structure that exemplifies a bridge that was common in rural Iowa and a great photo opp for not only the pontists and photographers, but for people who appreciate what this bridge has to offer.
And now, after having done the Guessing Quiz, let’s have a look at the results. What I’ve done here is numbered the bridge types and pointed them out in the picture with an arrow.
The green line indicates the decking of the bridge, the red is the bottom chord. The bottom chord consists of a square-shaped panel with diagonal beams cris-crossing each other like the letter X. For the top chord of a through truss bridge, it’s the same as one can see in nr. 13. While the side view of the bridge doesn’t specifically show what the chords look like, another diagram, done in 3D and from a bird’s eye perspective shows the cross section of the bridge, including its decking. The panels are the side chords where the vertical beams support the top and bottom chords. The diagonal beams, pending on the truss design, keeps the panel together and prevents it from folding.
What’s missing from this diagram are the lalley columns, which is nr. 16. Lally columns are cylindrical piers that are used to support the end post and the bottom bridge decking. Lallies, used up to ca. 1890, were the predecessor to concrete piers that were used when standardized trusses were built beginning between 1890 and 1900. The Henry Bridge has no lally column because the truss bridge is the lone span going across the river. It’s supported by the abutments alone, as marked with nr. 11. Railings, marked with nr. 12 were once built using iron and steel; many of them had lattice bracing. In later bridge constructions and when rehabilitated, concrete railings and decking were used.
While I hope the answers and the supplemental diagram are of some help, a closer version of the bridge can be found through a series of drone videos one can find in the social media, including youtube. This one presented below is a series on historic truss bridges spanning the Bear River in the US state of Utah. There you can get a close-up of where the truss parts are.
After looking at the parts of the truss bridge, the next bridge will feature a similar bridge type but one that was more commonly built before the truss bridge itself. As a hint, the Kern and Blackfriars Bridges are the two longest of their kind.
This Pic of the Week is also the first in a series of educational series on the anatomy of bridge types. For each bridge, there will be some terminologies involving bridge parts where you have to find and identify them. These words you will find in a box below.
Our first bridge type for the matching activity: The Truss Bridge. Match the bridge terms with the ones you find in the picture above. Also find the parts that do NOT appear in this picture. Good luck!
As for the bridge photo, this was taken at the Henry Bridge in Winneshiek County, Iowa in 2009. The bridge spans the Upper Iowa River on Scenic River Road northwest of Decorah and represents an example of a truss bridge that was built by the Clinton Bridge and Iron Works Company. It was one of two primary bridge builders in Winneshiek County during the age of truss bridge building between 1870 and 1920. The 1911 structure has a total length of 121 feet, has an A-frame portal bracing and pinned connections. Closed since 2016, plans are in the making to either rehabilitate the bridge to reopen for light traffic or repurpose it for bike and pedestrian use. And it’s a practical and sensible idea too, for the high bluffs of the river present an excellent backdrop for the bridge and provides an exclusive photo opportunity, especially as there is parking nearby. In fact, from various angles, even from the bluffs, one can get a great photo opportunity of this unique historic bridge. My photo formed the basis of an educational exercise like this one, where people of all ages and with a keen interest on bridges and history can take part.