I 93 NB over I 93 SB BT 46 - 57

Map 

Facts 

Name:	I 93 NB over I 93 SB BT 46 - 57
Structure number:	B162813BMDOTNBI
Location:	.5 MI N OF JCT I93&US1
Purpose:	Carries highway over highway
Route classification:	Principal Arterial - Interstate (Urban) [11]
Length of largest span:	82.0 ft. [25.0 m]
Total length:	898.0 ft. [273.7 m]
Roadway width between curbs:	62.0 ft. [18.9 m]
Deck width edge-to-edge:	68.9 ft. [21.0 m]
Vertical clearance above deck:	15.7 ft. [4.8 m]
Vertical clearance below bridge:	15.7 ft. [4.8 m]
Owner:	State Highway Agency [01]
Year built:	1970
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:	11
Main spans material:	Steel [3]
Main spans design:	Girder and floorbeam system [03]
Deck type:	Concrete Cast-in-Place [1]
Wearing surface:	Bituminous [6]

2010 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	96,400 [as of 2006]
Truck traffic:	20% of total traffic
Deck condition:	Satisfactory [6 out of 9]
Superstructure condition:	Satisfactory [6 out of 9]
Substructure condition:	Satisfactory [6 out of 9]
Scour condition:	Bridge not over waterway. [N]
Operating rating:	48.5 tons [44.1 metric tons]
Inventory rating:	35.6 tons [32.4 metric tons]
Evaluation:	Functionally obsolete [2]
Sufficiency rating:	77.0
Recommended work:	Other structural work, including hydraulic replacements. [38]
Estimated cost of work:	$4,789,000

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