1 vote

18 1/2 Mile Road Bridge

Street Views 


Concrete tee beam bridge over I-94 on 18 1/2 Mile Road
Marshall, Calhoun County, Michigan
Open to traffic
Built 1960
Concrete tee beam
Length of largest span: 70.9 ft.
Total length: 227.0 ft.
Deck width: 24.0 ft.
Approximate latitude, longitude
+42.28194, -84.93611   (decimal degrees)
42°16'55" N, 84°56'10" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/670173/4683143 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 1974)
Inventory numbers
MINBI 13113083000S030 (Michigan bridge number on the National Bridge Inventory 2010 and before)
MINEW 01277 (Michigan bridge number on the National Bridge Inventory 2011 and later)
BH 47543 (Bridgehunter.com ID)
Inspection report (as of August 2017)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 81.9 (out of 100)
View more at BridgeReports.com

Update Log 

  • January 12, 2014: New Street View added by Brent Tindall
  • January 7, 2011: Added by Matthew Lohry



18 1/2 Mile Road Bridge
Posted January 10, 2011, by Nathan Holth (form3 [at] historicbridges [dot] org)

Matthew... if anyone gives you a hard time for recognizing Michigan's beautiful, historic curved t-beams with Michigan's distinctively beautiful Type R4 railings, ignore them! I make strong arguments for these bridges over on HistoricBridges.org. You will not find nicer looking freeway overpasses in all of the MidWest. Other Midwestern states have curved t-beams, but I have not found any with decorative railings in the MidWest. Also note most of these bridges are at or near the 50 year requirement for consideration of National Register eligibility, so some of these bridges could potentially be "officially historic" in the future as well.

18 1/2 Mile Road Bridge
Posted January 7, 2011, by Matthew Lohry

I know what you're thinking--"MODERN/NOT HISTORIC". Actually, this bridge is significant for two reasons that I can think of. Even though it was built in 1960, it is an increasingly rare concrete curved T-beam bridge (reason #1), and it has its original and unmodified railings, which are beautiful and add great aesthetic value to the bridge overall (reason #2). My other reason for posting this bridge is to compare it to the St. Joe Road Overpass in Indiana, which was recently added. That bridge is classified as a concrete stringer bridge, but looking at the street view, is perfectly identical in superstructure construction to this one. I think that the St. Joe Road Overpass is most definitely a curved T-beam like this one.