I-75BL, M-72 over AU SABLE RIVER


+44.65968, -84.71230
44°39'35" N, 84°42'44" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:I-75BL, M-72 over AU SABLE RIVER
Structure number:000000000002031
Old structure number:20120012000B010 (from 1992 edition)
Purpose:Carries highway and pedestrian walkway over waterway
Route classification:Principal Arterial - Other (Rural) [02]
Length of largest span:40.0 ft. [12.2 m]
Total length:40.0 ft. [12.2 m]
Roadway width between curbs:42.0 ft. [12.8 m]
Deck width edge-to-edge:55.1 ft. [16.8 m]
Skew angle:30°
Owner:State Highway Agency [01]
Year built:1935
Historic significance:Bridge is on the National Register of Historic Places [1]
Design load:M 13.5 / H 15 [2]
Main span material:Steel [3]
Main span design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: May 2017

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:13,375 [as of 2015]
Truck traffic:4% of total traffic
Deck condition:Very Good [8 out of 9]
Superstructure condition:Very Good [8 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Better than present minimum criteria [7]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Sufficiency rating:74.7

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
May 2017GoodVery GoodVery GoodGood1337574.7
September 2015FairSatisfactorySatisfactoryFair1400062.4
October 2013FairSatisfactorySatisfactoryFair1400062.4
June 2011FairSatisfactorySatisfactoryFair1400063.9
November 2009FairSatisfactorySatisfactoryFair1400063.9
June 2007FairSatisfactorySatisfactoryFair1556563.2
June 2005FairSatisfactorySatisfactoryFair1200064.8
June 2003FairSatisfactorySatisfactoryFair1200063.1
August 2001FairGoodSatisfactorySatisfactory1200075.2
August 1999FairGoodSatisfactorySatisfactory1200075.2
August 1997FairGoodGoodSatisfactory1200075.2
August 1995FairSatisfactoryGoodGood1600073.3
June 1993FairSatisfactoryGoodGood1600068.7
April 1991GoodGoodGoodGood1600073.3

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Steel Girder/Beamlinear ft.360360000
Steel Protective Coatingsq. ft.3,2403,240000
Steel Abutmentlinear ft.9696000
Steel Protective Coatingsq. ft.240240000
Corrugated or Orthotropic Decksq. ft.2,2002,200000
Wearing Surfacessq. ft.1,6801,680000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.160160000