US 20 EB/BSTN PST over I 495


+42.34111, -71.57528
42°20'28" N, 71°34'31" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:US 20 EB/BSTN PST over I 495
Structure number:M060091L4DOTNBI
Location:1.8 MI. E. OF NTHBORO TL.
Purpose:Carries highway and pedestrian walkway over highway
Route classification:Other Principal Arterial (Urban) [14]
Length of largest span:76.1 ft. [23.2 m]
Total length:285.1 ft. [86.9 m]
Roadway width between curbs:36.1 ft. [11.0 m]
Deck width edge-to-edge:49.2 ft. [15.0 m]
Vertical clearance below bridge:16.4 ft. [5.0 m]
Owner:State Highway Agency [01]
Year built:1962
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:M 18 / H 20 [4]
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: May 2018

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:13,000 [as of 2017]
Truck traffic:12% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 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:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:78.5
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$6,601,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
May 2018FairFairFairFair1300078.5
May 2016FairFairFairFair3640070.4
May 2014FairFairFairFair3640069.4
May 2012FairSatisfactorySatisfactorySatisfactory3640061.0
May 2010FairSatisfactorySatisfactorySatisfactory3640061.0
May 2008FairSatisfactorySatisfactorySatisfactory3640061.0

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Steel Girder/Beamlinear ft.1,9601,160790100
Steel Protective Coatingsq. ft.18,5001,00011,5003,5002,500
Reinforced Concrete Decksq. ft.14,0235,6234,0004,4000
Wearing Surfacessq. ft.10,2835,2832,5002,5000
Reinforced Concrete Columneach1211100
Reinforced Concrete Abutmentlinear ft.1301141600
Reinforced Concrete Pier Caplinear ft.2001630370
Other Jointlinear ft.200000200
Movable Bearingeach35102500
Steel Protective Coatingsq. ft.70200500
Fixed Bearingeach3502780
Steel Protective Coatingsq. ft.70054160
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.3162764000