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IAIS Sylvan Slough Bridge

Through Girder Bridge over Sylvan Slough
Rock Island, Rock Island County, Illinois

Click the Photo Above to See All Photos of This Bridge!
Name IAIS Sylvan Slough Bridge
Built By Chicago, Rock Island & Pacific Railroad
Contractor Fort Pitt Bridge Works of Pittsburgh
Currently Owned By Iowa Interstate Railroad
Length 705 Feet Total, 105 Foot Main Spans
Width 2 Tracks, 1 In Use
Height Above Ground 15 Feet (Estimated)
Superstructure Type Through and Deck Plate Girder
Substructure Type Stone Masonry and Concrete
Date Built 1924
Traffic Count 6 Trains/Day (Estimated)
Current Status In Use
IAIS Bridge Number 1816
Significance Local Significance
Documentation Date December 2017


View an article regarding the construction of this bridge.

This large girder bridge crosses Sylvan Slough just east of the Government Bridge.
Built in 1924, it replaced a through truss bridge. While it is reported that the old truss bridge ended up at two different locations in nearby Milan, Illinois; the author has serious doubts about these claims.

Historic Photo
Plan of the current and previous bridge, from the Railway Age-Gazette; Volume 75

Currently, the bridge contains five through girder spans and a single deck girder span. The deck girder span was built well before the through girders, but was replaced in approximately 2014. The entire structure sits on concrete substructures.
While it was built for two tracks, only one is currently in use. The unused track has been fenced off.

Historic Photo
Construction of the current bridge, from the Railway Age-Gazette; Volume 75

The author has ranked this bridge as being locally significant, due to the common design and newer age.
The photo above is an overview. The bridge can be easily accessed from a trail on the east side.

Mississippi River Railroad Bridges
Upstream (Sylvan Slough) Sylvan Island Railroad Bridge
Main Channel Government Bridge
Downstream Crescent Bridge

Citations

Source Type

Source

Build Date Historic Article
Contractor Historic Article
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele