I 95 /ST128
I 95 /ST128 in 95/128 At ST-129 WB, Middlesex County, Massachusetts received a condition grade of C (50/100). Built in 1949, the bridge carries 129K vehicles daily on I 95 /ST128 over St129 WB Main ST.
I 95 /ST128 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 1949 and is now 77 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 95 /ST128 carries an average daily traffic count of 128,500 vehicles, with 6 lane(s) crossing St129 WB 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 95 /ST128 is a 77-year-old bridge located 95/128 At ST-129 WB in Middlesex County, Massachusetts. The bridge carries I 95 /ST128 over St129 WB Main ST with 6 traffic lanes, handling approximately 129K vehicles per day. Built in 1949 and reconstructed in 1959, the structure spans 20.4 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 6/9 (fair), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I 95 /ST128 has a Condition Score of 50/100 (Grade C). Its deck is rated 5/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I 95 /ST128 was built in 1949 and reconstructed in 1959, making it 77 years old. The average bridge age in the United States is 48 years.
I 95 /ST128 carries approximately 129K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 20.4 meters long and located on I 95 /ST128 in 95/128 At ST-129 WB, Middlesex County, Massachusetts.
No, I 95 /ST128 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 95 /ST128 is located 95/128 At ST-129 WB in Middlesex County, Massachusetts. The bridge carries I 95 /ST128 over St129 WB Main ST. Its coordinates are 42.525600, -71.079481. It is maintained by State Highway Agency.
I 95 /ST128 carries I 95 /ST128 over St129 WB Main ST. The bridge is 20.4 meters long and was built in 1949, with reconstruction in 1959.
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.