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M-3 (GRATIOT AVE) over I-375

Map 

Coordinates:
+42.33980, -83.04160
42°20'23" N, 83°02'30" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.

Facts 

Name:M-3 (GRATIOT AVE) over I-375
Structure number:000000000011799
Old structure number:82182251000S010 (from 1992 edition)
Location:DOWNTOWN DETROIT
Purpose:Carries highway and pedestrian walkway over highway
Route classification:Other Principal Arterial (Urban) [14]
Length of largest span:77.8 ft. [23.7 m]
Total length:298.9 ft. [91.1 m]
Roadway width between curbs:89.9 ft. [27.4 m]
Deck width edge-to-edge:119.8 ft. [36.5 m]
Vertical clearance below bridge:14.4 ft. [4.4 m]
Skew angle:17°
Owner:State Highway Agency [01]
Year built:1963
Year reconstructed:1996
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:5
Main spans material:Steel [3]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: December 2015 

Status:Open, no restriction [A]
Average daily traffic:12,807 [as of 2007]
Truck traffic:9% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Very Good [8 out of 9]
Substructure condition:Fair [5 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Underclearances appraisal:Basically intolerable requiring high priority of corrrective action [3]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Inventory rating:66.6 tons [60.5 metric tons]
Evaluation:Functionally obsolete [2]
Sufficiency rating:62.0

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
December 201562.0Functionally obsoleteGoodVery GoodFair12807
January 201462.0Functionally obsoleteGoodExcellentFair12807
January 201262.0Functionally obsoleteGoodGoodFair12807
March 201062.0Functionally obsoleteGoodGoodFair12807
July 200873.5Functionally obsoleteGoodVery GoodGood12807
July 200673.8Functionally obsoleteGoodVery GoodGood11335
July 200473.3Not deficientGoodVery GoodGood14000
July 200273.3Not deficientGoodVery GoodGood14000
May 200073.3Not deficientSatisfactoryVery GoodGood14000
September 199973.3Not deficientExcellentExcellentGood14000
December 199873.3Not deficientExcellentExcellent-14000
December 199722.2Not deficientSeriousPoorSerious14000
September 199620.8Not deficientSeriousPoorSerious16000
October 199517.4Structurally deficientSeriousPoorSerious19500
November 199239.2Structurally deficientPoorPoorPoor19500
March 199139.2Structurally deficientPoorPoorPoor19500