IAIS/Rock Island Bridge over Iowa River in Iowa City

(Bridge Hunter, 3D Satellite)

Douglas W. Jones released this photo to the Public Domain. From Wikimedia

Bill Kaeser posted three photos with the comment: "1901 Chicago, Rock Island & Pacific Railroad Bridge, Iowa City." The date 1901 is when the above steel girder bridge was built. This construction was in 1873.
Jeff Alberhasky These photos are of the 2nd CRI&P rail bridge over the Iowa River while it was under construction around 1873. It was the longest bridge West of the Mississippi River when it was completed. It was replaced by the present stucture in 1901.

Chris Lewandowski posted
I never thought I'd have the rare opportunity to see the largest diesel locomotive ever built run on the main line, but I did. And a bonus, finally got to see IAIS 513. Here is the Quad Cities Rocket, led by UP 6936 in Iowa City, Iowa. 9/20/2025

Geoffrey Symons: Impressive saw them stored years ago in Los Vegas yard, when visiting from the UK. What horsepower were the bi-centenial locos?

Steven Jarvis: First few had 7,000 hp then reduced to 6,600 hp speeds up to 90 MPH later governed to 72 mph.

Mike Moroni: Sean they were originally 3,600 hp each, de-rated to 3,300 hp to reduce engine problems at the high output rating. Total 6,600hp on one frame.

[This was an excursion run to raise money for the RRHMA. They run it on just short routes.]

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I the original piers were reused, then concrete was poured around them as well as on top of them. And I think piers were added between the existing piers because the trusses appear to be longer than the girders.