I 93 NB/US1NB
I 93 NB/US1NB in I 93 NB At ST 28, Norfolk County, Massachusetts received a condition grade of C (50/100). Built in 1958, the bridge carries 129K vehicles daily on I 93 NB/US1NB over ST 28 N Main ST.
I 93 NB/US1NB carries a C on the BridgeSafety Condition Score with 50/100. 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 NB/US1NB carries an average daily traffic count of 129,100 vehicles, with 5 lane(s) crossing ST 28 N Main ST. 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 NB/US1NB is a 68-year-old bridge located I 93 NB At ST 28 in Norfolk County, Massachusetts. The bridge carries I 93 NB/US1NB over ST 28 N Main ST with 5 traffic lanes, handling approximately 129K vehicles per day. Built in 1958, the structure spans 49.7 meters.
The bridge received a Condition Grade of C (50/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (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 NB/US1NB has a Condition Score of 50/100 (Grade C). Its deck is rated 5/9, superstructure 5/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I 93 NB/US1NB was built in 1958, making it 68 years old. The average bridge age in the United States is 48 years.
I 93 NB/US1NB carries approximately 129K vehicles per day (average daily traffic). The bridge has 5 traffic lanes. It is 49.7 meters long and located on I 93 NB/US1NB in I 93 NB At ST 28, Norfolk County, Massachusetts.
No, I 93 NB/US1NB 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 NB/US1NB is located I 93 NB At ST 28 in Norfolk County, Massachusetts. The bridge carries I 93 NB/US1NB over ST 28 N Main ST. Its coordinates are 42.205092, -71.064978. It is maintained by State Highway Agency.
I 93 NB/US1NB carries I 93 NB/US1NB over ST 28 N Main ST. The bridge is 49.7 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.