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Monroe Street Bridge


View North, Across Deck Of Bridge

Photo taken by Carla Anderson, May 1989, for HAER

View photos at Library of Congress

BH Photo #121376

Street View 


Concrete cantilever bridge over Raisin River on M-125 in Monroe
Monroe, Monroe County, Michigan
Open to traffic
Built 1927; Subsequent work 1970 & 1984; rehabilitated 1990
- W.H. Knapp Co. of Monroe, Michigan
"The Monroe Street Bridge is an early example of a reinforced concrete cantilever girder bridge, a design developed in the late 1910s as an alternative to standard concrete arch bridge designs. The bridge was a key component of a major upgrading of the US-25 (later M-125) highway linking Detroit to Toledo. The builder, the W.H. Knapp Co., built several concrete bridges in Monroe County in the 1920s.

"This documentation was undertaken in May 1989 in accordance with the Memorandum of
Agreement by the Federal Highway Administration, Michigan Department of Transportation, the State
Historic Preservation Officer, Advisory Council on Historic Preservation as a mitigative measure prior to the demolition of the bridge."

Dr. Charles K. Hyde, Department of History
Wayne State University
Detroit, Michigan 48202


Length of largest span: 43.0 ft.
Total length: 211.0 ft.
Deck width: 47.9 ft.
Also called
M-50/M-125 Bridge
Approximate latitude, longitude
+41.91750, -83.39667   (decimal degrees)
41°55'03" N, 83°23'48" W   (degrees°minutes'seconds")
Approximate UTM coordinates
17/301251/4643394 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2007)
Inventory numbers
MINBI 58158071000B040 (Michigan bridge number on the National Bridge Inventory 2010 and before)
MINEW 07140 (Michigan bridge number on the National Bridge Inventory 2011 and later)
BH 37191 (Bridgehunter.com ID)
Inspection report (as of August 2017)
Overall condition: Fair
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 77.2 (out of 100)
View more at BridgeReports.com

Update Log 

  • September 21, 2022: New photos from Paul Plassman
  • August 15, 2008: Added by J.R. Manning

Related Bridges 


  • J.R. Manning - thekitchenguy [at] sbcglobal [dot] net
  • HAER MI-35 - Monroe Street Bridge, Spanning River Raisin at Monroe Street, Monroe, Monroe County, MI
  • Historicbridges.org - by Nathan Holth
  • Paul Plassman