6 votes

WSOR - Viaduct Road Overpass


The West face

The bridge is built with two distinctly different types of stone, limestone and sandstone, note the change in colors. It was built in 1881 by the Chicago and Northwestern Railroad and modified in 1896. (The datestone on this side reads, "1896" while the datestone on the east side reads, "1881.") Heavy wing walls on both sides reinforce the structure.

Photo taken by J.R. Manning in August 2008


BH Photo #121781


Street View 


Stone arch bridge over Viaduct Road on Wisconsin & Southern (formerly C&NW)
Dane County, Wisconsin
Open to traffic
Built 1881 by Chicago & Northwestern Railway; widened for double tracks in 1896
- Chicago & North Western Railway (CNW)
- Wisconsin & Southern Railroad (WSOR)
Rock-faced, coursed ashlar, limestone and sandstone bridge with heavily battered wing walls at the four corners. It has a single semi-circular arch built with limestone voussoirs. The bridge was widened about 20' in 1896 to accomodate dual tracks, now a single track. Imperfections in the arch vault show where stone was added at that time. Springing about 2 feet above grade, the arch rises to a 12' clearance above a 24' span. The bridge is about 37' long and is about 47' wide. It is one of a handful of sandstone arch bridges, built by the C&NW that is extant.
This bridge is related to the Bram Street Bridge in Madison, as a contemporary that is built of the same materials about the same time on the same line that ran from Madison to Elroy. This line is still active, the line on the Bram Street Bridge, currently, is not active.
Span length: 37.0 ft.
Total length: 37.0 ft.
Deck width: 47.0 ft.
Vertical clearance above deck: 12.0 ft.
Also called
C&NW Railroad Bridge No. 293
Approximate latitude, longitude
+43.27834, -89.51053   (decimal degrees)
43°16'42" N, 89°30'38" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/296292/4794785 (zone/easting/northing)
Quadrangle map:
Inventory number
BH 34730 (Bridgehunter.com ID)

Update Log 

  • April 4, 2015: New photos from John Marvig
  • September 30, 2013: Updated by Luke Harden: Added categories "Chicago & North Western Railway", "Wisconsin & Southern Railroad"
  • September 30, 2013: Photo imported by Dave King
  • January 26, 2011: New Street View added by Eric Hanson
  • January 12, 2011: New photos from Eric Hanson
  • June 4, 2009: Updated by J.R. Manning: Updated historical data
  • September 20, 2008: Updated by J.R. Manning: Updated materials and added link to Bram Street Bridge
  • August 17, 2008: New photos from J.R. Manning


  • J.R. Manning - thekitchenguy [at] sbcglobal [dot] net
  • Eric Hanson
  • John Marvig - marvigj27 [at] gmail [dot] com


WSOR - Viaduct Road Overpass
Posted April 4, 2015, by John Marvig (marvigj27 [at] gmail [dot] com)

This bridge is by far not the only structure with two dates on this line. It appears the entire line from Madison to Baraboo was double tracked in 1896, meaning many arches and other steel girder bridges were widened in that year.