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Military Street Bascule Bridge (Old)

Photos 

West Elevation, Looking Southeast

The vertical truss appears to be a component of this bridge, but is an optical illusion. It is not a component of this bridge but is a railroad bridge downriver.

Photo taken by Carla Anderson, June 1990, for HAER

View photos at Library of Congress

BH Photo #120613

Map 

Street View 

Facts 

Overview
Lost Bascule Bridge over Black River on I-94/I-69 Business Loop in Port Huron
Location
Port Huron, St. Clair County, Michigan
Status
Replaced by new bridge
History
Built 1912-13; Replaced 1991
Builders
- Detroit Steel & Bridge Co. of River Rouge, Michigan
- McKenzie Bridge Co.
- Osborn Engineering Co. of Cleveland, Ohio
- Strauss Bascule Bridge Co. of Chicago, Illinois
Design
"The Military Street Bridge is [was] the oldest surviving bascule highway bridge in Michigan and is an excellent example of the underneath counterweight trunnion design developed by Jospeh B. Strauss, an important twentieth century American bridge engineer.

"The Military Street Bridge is a double-leaf bascule bridge of the Strauss trunion type, with counterweights and the operating machinery located beneath the deck.

"Each leaf consists of three parallel steel girders, placed 13 feet apart, center to center, surrounded by a steel framework, 65 feet wide and 54 feet long, which in turn, supports the roadway and sidewalks."

--Dr. Charles K. Hyde, Department of History
Wayne State University
for Federal Highway Administration, Michigan DOT and HAER
June 1990
Dimensions
Length of largest span: 54.0 ft.
Total length: 108.0 ft.
Deck width: 65.0 ft.
Also called
I-94/I-69 Business Loop Bridge
Approximate latitude, longitude
+42.97556, -82.42417   (decimal degrees)
42°58'32" N, 82°25'27" W   (degrees°minutes'seconds")
Approximate UTM coordinates
17/383871/4759084 (zone/easting/northing)
Quadrangle map:
Port Huron
Inventory number
BH 37124 (Bridgehunter.com ID)

Update Log 

  • September 26, 2013: New Street View added by Douglas Butler
  • August 10, 2008: Added by J.R. Manning

Sources