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Nearby Bridges in NBI 2021: 1


US 20 MAIN ST over RR MBTA/BMRR (Route: 20)
Num:W040152NHDOT634x
Posted for load [P]
Built: 1936, Reconstructed: 1991
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0.3 Miles (0.4 Kilometers)

Bridge Type
Main Span(s): Steel [3] Truss - Thru [10]
Approach Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Bituminous [6]
Bridge Dimensions
Length: 71.3 m = 233.9 ft
Main Spans: 1 at 35.1 m = 115.2 ft
Approach Spans: 2
Skew: 32
Width, Roadway: 18.3 m = 60.0 ft (4 Lanes) and Out-To-Out: 25.9 m = 85.0 ft for a 9.8 m = 32.2 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Waltham [72600]: Middlesex County [017], Massachusetts [25]
Owned by State Highway Agency [01], DOT District: 4
.16 KM E JCT 60 & 20
Condition
Deck: Fair [5]
Superstructure: Fair [5]
Substructure: Fair [5]
Loading
Design: M 18 / H 20 [4]
Operating: 63 metric ton = 69.3 tons (Load Factor(LF) [1])
Inventory: 37.7 metric ton = 41.5 tons (Load Factor(LF) [1])
Appraisal
Structural: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck Geometry: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Better than present minimum criteria [7]
Waterway: N/A [N] and Bridge not over waterway. [N]
Inspections
Date: February 2020 [0220] and Frequency: 24
Future Work
Work Needed: Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Bridge Detour: 0.5 km = 0.3 mi
Traffic
ADT: 28190 (2020) and Trucks: 3%
Future ADT: 43589 (In 2033 )

Special Bridge Conditions Legend: R - Former location of relocated bridge. ! - At risk for demolition or destruction. X - Confirmed demolished or collapsed. S  - Dismantled and/or in storage. L -  Severe loss of historic integrity due to alteration.

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