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Current view of Iowa Falls Bridge Courtesy
of the Iowa Falls Historic Preservation Commission | This
long-span concrete structure spans the Iowa River in Iowa Falls. Carrying U.S.
Highway 65 (Oak Street) in a somewhat urban setting, this open spandrel arch features
two massive ribs, upon which bear a series of paneled concrete columns. At its
construction in 1928, the Iowa State Highway Commission (ISHC) described the bridge
as the "longest arch span either concrete or steel in the state of Iowa." The
Weldon Brothers Construction Company built the 255-foot long Iowa Falls Bridge
at a total cost of $51,375. The Iowa Department of Transportation awarded the
construction contract to the Iowa Falls firm on July 9, 1927. The ISHC used this
banner headline to depict the concrete landmark: "Nature Gives Scenic Beauty Touch
to New Jefferson Highway Bridge at Iowa Falls." Since its completion, the Iowa
Falls Bridge has carried a steady stream of urban traffic for 65 years with minimal
alterations.
Historic view of the Iowa Falls Bridge Courtesy
of the Iowa Falls Historic Preservation Commission |
| "Iowa Falls residents are fortunate in having the most beautiful
and most picturesque section of the Iowa River thru the heart of the town," the
ISHC stated in 1927. Although highway commission engineers typically used riveted
steel trusses for medium-span river crossings in rural settings, they used concrete
open spandrel arches for a number of urban and small town structures in the 1920s.
The Mederville Bridge, built in 1918, was apparently the first of these, designed
as an alternate to a steel truss bridge. This was followed by the Adair Viaduct
in 1923 and the Iowa Falls Bridge in 1928. By using open spandrel arches, ISHC
could achieve a relatively long span at a reasonable cost, while contributing
aesthetically to the urban settings in which the bridges stood. But given the
restrictive parameters of the arches' use--urban setting, long-span crossing,
sufficient vertical clearance--only a few were built during this period. The Iowa
Falls Bridge is distinguished as a well-preserved example of this application
of urban bridge design. A centerpiece for this small city, it is a local landmark
and an important transportation-related resource. The Iowa Falls Bridge
is still in use today at the crossing of Hwy. 65 South (Oak St.) over the Iowa
River .
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