Bridge Type
Main Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Approach Span(s): Other [00]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Bituminous [6]
Bridge Dimensions
Length: 20.4 m = 66.9 ft
Main Spans: 1 at 18 m = 59.1 ft
Approach Spans: 0
Skew: 5
Width, Roadway: 9.1 m = 29.9 ft (2 Lanes) and Out-To-Out: 12.8 m = 42.0 ft for a 9.1 m = 29.9 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Tyngsborough [71025]: Middlesex County [017], Massachusetts [25]
Owned by State Highway Agency [01], DOT District: 4
AT TYNGSBOROUGH BRIDGE
Condition
Deck: Good [7]
Superstructure: Very Good [8]
Substructure: Satisfactory [6]
Loading
Design: MS 18 / HS 20 [5]
Operating: 78.9 metric ton = 86.8 tons (Load Factor(LF) [1])
Inventory: 47.3 metric ton = 52.0 tons (Load Factor(LF) [1])
Appraisal
Structural: Equal to present minimum criteria [6]
Deck Geometry: Basically intolerable requiring high priority of corrrective action [3]
Road Alignment: Equal to present desirable criteria [8]
Waterway: N/A [N] and Bridge not over waterway. [N]
Inspections
Date: October 2020 [1020] and Frequency: 24
Future Work
Work Needed: Widening of existing bridge or other major structure without deck rehabilitation or replacement [33]
Bridge Detour: 2.3 km = 1.4 mi
Traffic
ADT: 22300 (2020) and Trucks: 10%
Future ADT: 16741 (In 2033
)