I 93 SB over COMB I90 & AMTRAK


+42.34624, -71.06091
42°20'46" N, 71°03'39" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:I 93 SB over COMB I90 & AMTRAK
Structure number:B166569Q6DOTNBI
Location:UNIT 4
Purpose:Carries highway over highway and railroad
Route classification:Principal Arterial - Interstate (Urban) [11]
Length of largest span:205.4 ft. [62.6 m]
Total length:633.9 ft. [193.2 m]
Roadway width between curbs:55.1 ft. [16.8 m]
Deck width edge-to-edge:57.4 ft. [17.5 m]
Vertical clearance above deck:16.7 ft. [5.1 m]
Vertical clearance below bridge:13.1 ft. [4.0 m]
Owner:State Highway Agency [01]
Year built:2000
Historic significance:Historical significance is not determinable at this time [4]
Design load:MS 18 / HS 20 [5]
Number of main spans:4
Main spans material:Prestressed concrete continuous [6]
Main spans design:Segmental box girder [21]
Deck type:Other [9]
Wearing surface:Latex Concrete or similar additive [3]

Latest Available Inspection: August 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:106,231 [as of 2011]
Truck traffic:7% of total traffic
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:Basically intolerable requiring high priority of replacement [2]
Underclearances appraisal:Superior to present desirable criteria [9]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Pier/abutment protection:Navigation protection not required [1]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:62.6
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$17,585,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
August 2017FairGoodSatisfactoryGood10623162.6
August 2015FairGoodSatisfactoryGood10623162.6
August 2013GoodGoodGoodGood10623162.6
August 2011GoodGoodGoodGood9180067.9
June 2009GoodGoodGoodGood9180067.9

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Prestressed Concrete Closed Web/Box Girderlinear ft.1,2671,17186100
Prestressed Concrete Top Flangesq. ft.37,22236,942223570
Wearing Surfacessq. ft.35,63834,4381,19910
Reinforced Concrete Columneach97200
Reinforced Concrete Pier Walllinear ft.6262000
Reinforced Concrete Pier Caplinear ft.78344310
Assembly with Sealeach115882700
Elastomeric Bearingeach2014600
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.1,2671,2442210