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Seaway International Bridge (South)


Seaway International Bridge (South)

Photo from Seaway News

License: Creative Commons Attribution-Share-Alike (CC BY-SA)


View this photo at cornwallseawaynews.com

BH Photo #470242



This bridge is one of two bridges that comprise the Seaway International Bridge/Three Nations Crossing. The south channel bridge is a traditional wire cable suspension bridge. However, the stiffening truss of the bridge is unusual in that it is a "railing height" truss - part deck truss and part pony truss. Instances of this rare arrangement outside of Chicago, Illinois where it was developed are exceedingly uncommon.


Suspension bridge over St. Lawrence River South Channel in Massena
St. Lawrence County, New York
Open to traffic
Built 1958
- American Bridge Co. of New York
Wire/cable suspension
Length of largest span: 894.7 ft.
Total length: 3,480.2 ft. (0.7 mi.)
Deck width: 26.9 ft.
Also called
Massena-Cornwall International Bridge
Approximate latitude, longitude
+44.99056, -74.73989   (decimal degrees)
44°59'26" N, 74°44'24" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/520503/4981934 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2011)
Inventory numbers
NY 5523220 (New York State bridge identification number)
BH 79777 (Bridgehunter.com ID)
Inspection report (as of September 2018)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Fair (5 out of 9)
Sufficiency rating: 49 (out of 100)
View more at BridgeReports.com

Update Log 

  • April 27, 2020: New photo from Geoff Hubbs
  • April 15, 2020: New photo from Geoff Hubbs
  • April 15, 2020: Updated by Nick Boppel: Updated entry
  • December 21, 2017: Added by Dana and Kay Klein



Seaway International Bridge (South)
Posted April 15, 2020, by Nick Boppel (nickboppel01 [at] gmail [dot] com)

It's unfortunate and rather quite strange that there do not appear to be any photos of the southern suspension bridge available on the Internet other than Nathan Holth's photos at HistoricBridges.org, which are clearly labeled as "Do not reuse". Someone should try to find and/or obtain a photo of the southern span. Perhaps I'll try to get up there this summer, but with coronavirus, who knows what will happen.