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CTA Red/Green Lines - Dan Ryan Double Bridge

Photo 

Double Bridge south view from highway

Panaramio user Przemek Kanadys, April 2012

View this photo at ssl.panoramio.com

BH Photo #315229

Map 

Description 

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.

Facts 

Overview
Steel stringer bridge over I/90-94, CTA Red Line 'L' on CTA Green Line 'L'
Location
Chicago, Cook County, Illinois
Status
Open to traffic
History
Original 'L' line built 1905. Bridge built 1961 as part of construction of Dan Ryan Expressway
Railroads
- Chicago Transit Authority (CTA)
- Rapid Transit
Design
Steel stringer bridge carrying an older steel stringer bridge as its load
Dimensions
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:
Englewood
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

Sources 

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