I 93 SB/US1SB
I 93 SB/US1SB in I 93 SB At ST 28, Norfolk County, Massachusetts received a condition grade of C (54/100). Built in 1958, the bridge carries 142K vehicles daily on I 93 SB/US1SB over ST 28 Randolph RD.
I 93 SB/US1SB carries a C on the BridgeSafety Condition Score with 54/100. Component ratings sit in the middle of the FHWA NBI distribution; rehabilitation programming is likely on the owning agency’s medium-term horizon.
The bridge was built in 1958 and is now 68 years old, at or past the typical 50-year design life for bridges of its vintage. Maintenance and inspection cycles are correspondingly more involved than for newer structures. I 93 SB/US1SB carries an average daily traffic count of 142,000 vehicles, with 5 lane(s) crossing ST 28 Randolph RD. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
Component Ratings
The riding surface, evaluated for cracking, spalling, and wear
Beams, girders, and trusses that support the deck
Piers, abutments, and foundations below the deck
Bridge Details
About This Bridge
I 93 SB/US1SB is a 68-year-old bridge located I 93 SB At ST 28 in Norfolk County, Massachusetts. The bridge carries I 93 SB/US1SB over ST 28 Randolph RD with 5 traffic lanes, handling approximately 142K vehicles per day. Built in 1958, the structure spans 52.7 meters.
The bridge received a Condition Grade of C (54/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 5/9 (fair), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I 93 SB/US1SB has a Condition Score of 54/100 (Grade C). Its deck is rated 6/9, superstructure 5/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I 93 SB/US1SB was built in 1958, making it 68 years old. The average bridge age in the United States is 48 years.
I 93 SB/US1SB carries approximately 142K vehicles per day (average daily traffic). The bridge has 5 traffic lanes. It is 52.7 meters long and located on I 93 SB/US1SB in I 93 SB At ST 28, Norfolk County, Massachusetts.
No, I 93 SB/US1SB is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I 93 SB/US1SB is located I 93 SB At ST 28 in Norfolk County, Massachusetts. The bridge carries I 93 SB/US1SB over ST 28 Randolph RD. Its coordinates are 42.205864, -71.065458. It is maintained by State Highway Agency.
I 93 SB/US1SB carries I 93 SB/US1SB over ST 28 Randolph RD. The bridge is 52.7 meters long and was built in 1958.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.
Source: FHWA National Bridge Inventory, 2026.