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CTA Red/Green Lines - Dan Ryan Double Bridge


Double Bridge south view from highway

Panaramio user Przemek Kanadys, April 2012

View this photo at ssl.panoramio.com

BH Photo #315229

Street View 


Distinctive "bridge carrying a bridge" is a point of interest to drivers on the Dan Ryan Expressway and train passengers on the CTA Red and Green Lines. When the Dan Ryan was routed to pass beneath the tracks of the Englewood Branch 'L' line in 1960, it was necessary to build a new bridge to carry trains across the highway. It was also necessary to minimize disruption to the transit route during construction. So instead of demolishing the 'L' tracks and building an entirely new bridge, which would have taken too much time, they simply slid this new bridge in underneath the old one. The result is a double bridge; one bridge carrying another on top. In 1969, the new Dan Ryan Branch 'L' line was opened in the median of the highway underneath, though there is no way transfer between the two rail lines at this point.

The upper original bridge belongs to and is maintained by the Chicago Transit Authority. The newer lower bridge, which supports the upper bridge, belongs to and is maintained by the Illinois Department of Transportation.


Steel stringer bridge over I/90-94, CTA Red Line 'L' on CTA Green Line 'L'
Chicago, Cook County, Illinois
Open to traffic
Original 'L' line built 1905. Bridge built 1961 as part of construction of Dan Ryan Expressway
- Chicago Transit Authority (CTA)
- Rapid Transit
Steel stringer bridge carrying an older steel stringer bridge as its load
Length of largest span: 87.9 ft.
Total length: 424.2 ft.
Also called
CTA Red/Green Lines - Dan Ryan Expressway Overpass
Approximate latitude, longitude
+41.78673, -87.63108   (decimal degrees)
41°47'12" N, 87°37'52" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/447561/4626290 (zone/easting/northing)
Quadrangle map:
Inventory numbers
IL 016-0141 (Illinois bridge number)
BH 59192 (Bridgehunter.com ID)

Update Log 

  • February 7, 2015: Photo imported by Roger Deschner
  • April 2, 2014: Updated by Roger Deschner: Explain divided ownership of the parts of this bridge
  • January 10, 2014: Added by Roger Deschner


  • Roger Deschner - rogerdeschner [at] gmail [dot] com