I 495
I 495 in .5 MI S Merrimac River, Essex County, Massachusetts received a condition grade of C (53/100). Built in 1963, the bridge carries 124K vehicles daily on I 495 over HWY Massachusetts AVE. It is classified as structurally deficient.
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 495 is a 63-year-old bridge located .5 MI S Merrimac River in Essex County, Massachusetts. The bridge carries I 495 over HWY Massachusetts AVE with 6 traffic lanes, handling approximately 124K vehicles per day. Built in 1963 and reconstructed in 1987, the structure spans 34.1 meters.
The bridge received a Condition Grade of C (53/100) based on Federal Highway Administration inspection data. Its deck is rated 4/9 (poor), superstructure 6/9 (fair), and substructure 6/9 (fair). The bridge is classified as structurally deficient, meaning at least one major component is rated 4 or below — this signals a need for repair or replacement but does not necessarily indicate an immediate safety hazard.
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I 495 has a Condition Score of 53/100 (Grade C). Its deck is rated 4/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is classified as structurally deficient.
I 495 was built in 1963 and reconstructed in 1987, making it 63 years old. The average bridge age in the United States is 48 years.
I 495 carries approximately 124K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 34.1 meters long and located on I 495 in .5 MI S Merrimac River, Essex County, Massachusetts.
Yes, I 495 is classified as structurally deficient because at least one of its primary components (deck, superstructure, or substructure) is rated 4 or below on the 0-9 NBI scale. This does not necessarily mean it is unsafe, but it requires significant repair or replacement.
I 495 is located .5 MI S Merrimac River in Essex County, Massachusetts. The bridge carries I 495 over HWY Massachusetts AVE. Its coordinates are 42.697658, -71.142075. It is maintained by State Highway Agency.
I 495 carries I 495 over HWY Massachusetts AVE. The bridge is 34.1 meters long and was built in 1963, with reconstruction in 1987.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.