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Ninth Street Swing Bridge


Ninth Street Swing Bridge


Photo taken by Douglas Butler in March 2018


BH Photo #419165



The Swing Bridge permits the flow of vehicular traffic along Division Street to cross the Chicago S&S Canal. The bridge consists of twelve sections, with the pivoting mechanism located in the fifth section from the east bank. The bridge opens to permit Canal traffic to pass through. The bridge is of a Pratt truss type construction, with vertical compression members and diagonal tension members.

-- Historic American Engineering Record


Lost Through truss bridge over Sanitary & Ship Canal on Old 9th Street
Lockport, Will County, Illinois
Replaced by a new bridge in 1972
Through truss
Also called
Butterfly Dam Bridge
Approximate latitude, longitude
+41.59158, -88.06580   (decimal degrees)
41°35'30" N, 88°03'57" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/411170/4604980 (zone/easting/northing)
Quadrangle map:
Inventory number
BH 56243 (Bridgehunter.com ID)


Bobtail Swing Bridge (25)
Illinois (4,752)
Lockport, Illinois (11)
Lost (25,266)
Lost 1972 (80)
Lost during 1970s (804)
Movable (3,004)
Replaced by new bridge (17,009)
Swing (1,474)
Through truss (15,283)
Truss (33,136)
Will County, Illinois (136)

Update Log 

  • March 9, 2018: New photo from Douglas Butler
  • December 14, 2015: New photo from Douglas Butler
  • December 13, 2015: New photos from Luke
  • December 13, 2015: New photo from Douglas Butler
  • May 14, 2013: Added by Frank Hicks


  • Frank Hicks
  • Douglas Butler
  • HAER IL-16-D - Lockport Historic District, Chicago Sanitary & Ship Canal, Swing Bridge, Sixteenth Street, Lockport, Will County, IL
  • Luke


Ninth Street Swing Bridge
Posted February 6, 2017, by Douglas Butler

Maybe it's the 9th street that you have posted. Just guessing probably this one.

Ninth Street Swing Bridge
Posted February 5, 2017, by Dana and Kay Klein

Luke and Doug cant tell which is 16th and which is 9th?

Ninth Street Swing Bridge
Posted December 15, 2015, by Anonymous

The bridge shown here (and the description) are the Division Street bridge, also known as 16th Street bridge. The 9th street replacement bridge (high bridge) can be seen in the background of several of the photos.

Ninth Street Swing Bridge
Posted May 18, 2013, by Anonymous

If you use Google Earth view I think you can see the remains of the butterfly dam that used to stand in the centerline of the canal there at that narrow area just north of the ninth street bridge. Just south of the controlling works. Looks to me like when they removed it from service that they just went south a little bit and just laid it on its side along the western canal bank. Fascinating piece of engineering. I've never heard of another one like it anywhere.

Ninth Street Swing Bridge
Posted May 18, 2013, by Anonymous

There are actually pictures of this bridge somewhere. I'll see if I can find them. Might be with HAER.