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6th Street Bridge


6th Street Bridge

looking south in 1910


View this photo at brooklineconnection.com

BH Photo #490286


Lost Pennsylvania through truss bridge over Allegheny River on 6th Street
Pittsburgh, Allegheny County, Pennsylvania
Replaced by a new bridge
Built 1893; relocated to Coraopolis in 1927
- Theodore Cooper (Engineer)
- Union Bridge Co. of Buffalo, New York & Athens, Pennsylvania
Pennsylvania through truss
Length of largest span: 440.0 ft.
Also called
Federal Street Bridge
Approximate latitude, longitude
+40.44512, -80.00319   (decimal degrees)
40°26'42" N, 80°00'11" W   (degrees°minutes'seconds")
Approximate UTM coordinates
17/584533/4477640 (zone/easting/northing)
Inventory number
BH 92154 (Bridgehunter.com ID)

Update Log 

  • March 7, 2022: New photo from Geoff Hubbs
  • April 30, 2021: New photo from Geoff Hubbs
  • February 11, 2021: Updated by Luke: Corrected "builder" to to pre-existing builder category
  • February 10, 2021: New photo from Geoff Hubbs
  • January 18, 2017: New photo from Dana and Kay Klein
  • September 22, 2016: Added by Dave King

Related Bridges 



6th Street Bridge
Posted February 21, 2022, by Tony Dillon (spansaver [at] hotmail [dot] com)

I was anon before... My puter was being wonky this morning!

I've just never cared for the name, because Squire Whipple had nothing to do with it... except for maybe a little inspiration lol.

6th Street Bridge
Posted February 21, 2022, by Paul Plassman

Thanks, Nathan!

Also, that makes sense as far as the odd number of panels. I can't say I've ever seen it before so it struck me as odd, especially given that the 6th Street trusses seem to be somewhat taller and with the top chord having a more arched shape than usual.

Granted, Triple Whipple really should be called Triple Pratt, but that would be boring....no alliteration! :)

6th Street Bridge
Posted February 21, 2022, by Nathan Holth (webmaster [at] historicbridges [dot] org)

Pages merged.

6th Street Bridge
Posted February 21, 2022, by Anonymous

The use of a set of diagonals across 3 panels in the center was likely just a modification made for a Pennsylvania truss having an odd number of panels. If it were a true triple-intersection truss like Indiana's Laughery Creek Bridge (I despise the name "Triple Whipple" as it is nothing more than a false moniker) it would involve more than one grouping of panels.

6th Street Bridge
Posted February 20, 2022, by Paul Plassman


I believe that this bridge is the same as BH 73834 and should be merged.

Nobody seems to have pointed out one of the more unusual details of this bridge, namely the diagonals in the middle three panels that cross all three panels rather than just two as in a typical Pennsylvania truss. Kind of like a curved-chord version of Indiana's Triple Whipple Bridge.