Cantilever K-Truss Bridge Imploded on 9 March; Running Slough Bridge also to Disappear.
SAVANNA, IL/ SABULA, IA- The end of an era has come for residents of the towns of Savanna and Sabula. One month after the replacement span- a tied-through arch bridge spanning the Mississippi River opened to through traffic, construction crews brought down the Savanna-Sabula Cantilever Truss Bridge on 9 March. Over 300 charges in 21 different places were used to bring down the main span. The Savanna-Sabula Bridge was built in 1932 by the Minneapolis Bridge Company, one of the major bridge companies that belonged to the Minneapolis School of Bridge Building, which featured the likes of Commodore P. Jones, the Hewett Family (Seth, William and Arthur) and Alexander Bayne, to name a few. Jones founded the company in 1887 and at the time of the construction of this bridge, Bayne was president of the company. The bridge had a span of 2481 feet, its main span was 520 feet. The blue-colored cantilever span featured a K-truss through truss span, one of the rarest of its kind in the country. The portal bracings were X-framed but a plaque was located on the Illinois end of the span. A video of the drive across the bridge can be seen below:
Because of its narrowness, combined with the roadway being in a flood plain and problems with river navigation, officials from Iowa and Illinois agreed to build a new span in 2013 while trying to give away the bridge to a party wishing to relocate it (see article here) Unfortunately there were no takers and therefore, the bridge was condemned, however some pieces will be reused for an exhibit in both ends, serving as a reminder of the bridge’s time as a toll bridge, serving the Short Route, connecting Cedar Rapids with Chicago.
Several videos of the bridge’s demolitions were taken, as it became a pile of scrap metal as of 10:35am on Friday the 9th of March, 2018. Some examples are shown below:
The Pratt through truss approach spans to the main span will be dismantled and the demolition of the bridge will be completed by May. At the same time, another accessory connecting Savanna and Sabula, the Running Slough Bridge (as pictured below) is being removed even as this article is released. The Pratt through truss span with West Virginia portals was built at the same as the Savanna-Sabula span and was the entry point to Sabula. The bridge was originally scheduled to be replaced this summer. However the partial collapse of one of the approach spans has prompted Iowa DOT to move the timeline forward and remove the bridge right away. At present, the new span is to be built and opened by the end of May. Whether this date is realistic depends on the weather conditions, especially because of the harsh winter the region has had, combined with possible flooding caused by the spring thaw.