I 93 SB over COMB I90 & AMTRAK


+42.34528, -71.06083
42°20'43" 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 below bridge:28.5 ft. [8.7 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 2015

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]
Operating rating:50.7 tons [46.1 metric tons]
Inventory rating:30.4 tons [27.6 metric tons]
Sufficiency rating:62.6
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$19,114,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
August 201562.6FairGoodSatisfactoryGoodFO106231
August 201362.6GoodGoodGoodGoodFO106231
August 201167.9GoodGoodGoodGoodFO91800
June 200967.9GoodGoodGoodGoodFO91800

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Prestressed Concrete Closed Web/Box Girderlinear ft.1,26701,26520
Reinforced Concrete Decksq. ft.36,37434,5551,81900
Wearing Surfacessq. ft.36,37434,5551,81900
Reinforced Concrete Columneach99000
Reinforced Concrete Pier Walllinear ft.6256600
Reinforced Concrete Pier Caplinear ft.78062160
Assembly with Sealeach1151031200
Elastomeric Bearingeach2014600
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.1,2671,01425300