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I 495 NB over COMB FORBS//AMTRAK/MBTA

Map

Coordinates:
+42.01328, -71.23390
42°00'48" N, 71°14'02" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:I 495 NB over COMB FORBS//AMTRAK/MBTA
Structure number:M030343RGDOTNBI
Location:1.9 MI E OF I 95
Purpose:Carries highway over highway and railroad
Route classification:Principal Arterial - Interstate (Urban) [11]
Length of largest span:96.1 ft. [29.3 m]
Total length:183.1 ft. [55.8 m]
Roadway width between curbs:54.1 ft. [16.5 m]
Deck width edge-to-edge:57.7 ft. [17.6 m]
Vertical clearance below bridge:13.1 ft. [4.0 m]
Skew angle:15°
Owner:State Highway Agency [01]
Year built:1978
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:2
Main spans material:Prestressed concrete [5]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: February 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:35,463 [as of 2011]
Truck traffic:10% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Satisfactory [6 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:Equal to present minimum criteria [6]
Underclearances appraisal:Basically intolerable requiring high priority of corrrective action [3]
Roadway alignment appraisal:Superior to present desirable criteria [9]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:70.9
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$5,293,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
February 2017FairSatisfactorySatisfactoryFair3546370.9
February 2015FairSatisfactoryFairFair4000070.0
March 2013FairGoodFairFair4000070.0
March 2011FairGoodFairFair4000070.0
March 2009FairGoodFairFair4000070.0

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
ElementUnitsQuantity1-Good2-Fair3-Poor4-Serious
Superstructure
Prestressed Concrete Girder/Beamlinear ft.1,4291,27390660
Deck
Reinforced Concrete Decksq. ft.10,1679,67349400
Wearing Surfacessq. ft.9,6039,10949400
Substructure
Reinforced Concrete Pier Walllinear ft.58144400
Reinforced Concrete Abutmentlinear ft.22817436180
Joints
Pourable Jointlinear ft.114114000
Bearings
Elastomeric Bearingeach3603600
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.499049900