M-3 NB CONN over I-75 & I-375


+42.34327, -83.04400
42°20'36" N, 83°02'38" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.


Name:M-3 NB CONN over I-75 & I-375
Structure number:000000000011808
Old structure number:82182251000S081 (from 1992 edition)
Location:IN DETROIT OVER I-375
Purpose:Carries highway over highway
Route classification:Principal Arterial - Other Freeways or Expressways (Urban) [12]
Length of largest span:79.1 ft. [24.1 m]
Total length:361.6 ft. [110.2 m]
Roadway width between curbs:44.0 ft. [13.4 m]
Deck width edge-to-edge:47.2 ft. [14.4 m]
Vertical clearance below bridge:16.1 ft. [4.9 m]
Skew angle:12°
Owner:State Highway Agency [01]
Year built:1964
Year reconstructed:1998
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18+Mod / HS 20+Mod [6]
Number of main spans:7
Main spans material:Steel [3]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: November 2015 

Status:Open, no restriction [A]
Average daily traffic:22,748 [as of 2007]
Deck condition:Good [7 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Equal to present minimum criteria [6]
Underclearances appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Operating rating:70.6 tons [64.2 metric tons]
Inventory rating:42.5 tons [38.6 metric tons]
Sufficiency rating:99.0

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
November 201599.0Not deficientGoodSatisfactoryGood22748
March 201455.0Structurally deficientGoodSeriousGood22748
March 201255.0Structurally deficientGoodSeriousGood22748
April 201055.0Structurally deficientVery GoodSeriousGood22748
May 200899.0Not deficientVery GoodSatisfactoryGood22748
May 200669.0Not deficientVery GoodFairPoor28332
February 200573.0Not deficientVery GoodFairPoor13480
November 200369.0Not deficientVery GoodFairPoor13480
November 200269.0Not deficientVery GoodFairPoor13480
August 200169.0Not deficientVery GoodFairPoor13480
May 200069.0Not deficientVery GoodFairPoor13480
September 199942.0Not deficientSeriousFairSerious13480
August 199847.0Not deficientSeriousFairSerious13480
July 199733.0Structurally deficientPoorFairSerious13480
September 199668.0Structurally deficientPoorFairPoor13480
August 199484.0Structurally deficientPoorFairFair13480
August 199268.0Structurally deficientSatisfactorySatisfactoryPoor13480
June 199095.0Functionally obsoleteSatisfactoryGoodSatisfactory13480