I 495 NB over COMB FORBS//AMTRAK/MBTA

Map

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

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]`

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

Date	Condition	Deck	Superstructure	Substructure	ADT	Suff. Rating
February 2017	Fair	Satisfactory	Satisfactory	Fair	35463	70.9
February 2015	Fair	Satisfactory	Fair	Fair	40000	70.0
March 2013	Fair	Good	Fair	Fair	40000	70.0
March 2011	Fair	Good	Fair	Fair	40000	70.0
March 2009	Fair	Good	Fair	Fair	40000	70.0

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.

Element	Units	Quantity	1-Good	2-Fair	3-Poor	4-Serious
Superstructure
Prestressed Concrete Girder/Beam	linear ft.	1,429	1,273	90	66	0
Deck
Reinforced Concrete Deck	sq. ft.	10,167	9,673	494	0	0
Wearing Surfaces	sq. ft.	9,603	9,109	494	0	0
Substructure
Reinforced Concrete Pier Wall	linear ft.	58	14	44	0	0
Reinforced Concrete Abutment	linear ft.	228	174	36	18	0
Joints
Pourable Joint	linear ft.	114	114	0	0	0
Bearings
Elastomeric Bearing	each	36	0	36	0	0
Bridge Rail
Reinforced Concrete Bridge Rail	linear ft.	499	0	499	0	0