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Black Bridge

Black Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 10, 2013

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
360th Street Over Iowa River
Location
Rural: Tama County, Iowa: United States
Structure Type
Metal 9 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Metal 4 Panel Rivet-Connected Warren Pony Truss,
Construction Date and Builder / Engineer
1914 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1972
Main Span Length
168 Feet (51 Meters)
Structure Length
250 Feet (76 Meters)
Roadway Width
14.8 Feet (4.51 Meters)
Spans
1 Main Span(s) and 1 Approach Span(s)
NBI Number
316740

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge consists of two spans, one a pin-connected through truss and the other a rivet-connected Warren pony truss. The 1914 date given for the construction of this bridge (assuming its correct, which is not for certain) would place the pin-connected truss as a very late example of its kind. The riveted Warren pony truss approach span appears to have been moved to this location from elsewhere at a later date, based on the difference in design between the two spans, and also the fact that the pony truss span sits somewhat unusually upon the caisson pier which has pieces of floorbeams from other truss bridges stacked up to bring the truss bridge up to the right height to match the level of the through truss. This is obviously a bridge with a story to tell, and very little is currently known about the bridge. It would be nice to learn more about its history.

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Photo Galleries and Videos: Black Bridge

 
View Photo Gallery
Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Video
CarCam: Southbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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Maps and Links: Black Bridge

Coordinates (Latitude, Longitude):

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Bridgehunter.com: View listed bridges within a half mile of this bridge.

Bridgehunter.com: View listed bridges within 10 miles of this bridge.

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