I 93
I 93 in At Merrimac River, Essex County, Massachusetts received a condition grade of C (58/100). Built in 1959, the bridge carries 133K vehicles daily on I 93 over HWY Riverside DR.
I 93 carries a C on the BridgeSafety Condition Score with 58/100. 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 1959 and is now 67 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 carries an average daily traffic count of 133,000 vehicles, with 8 lane(s) crossing HWY Riverside DR. 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 is a 67-year-old bridge located At Merrimac River in Essex County, Massachusetts. The bridge carries I 93 over HWY Riverside DR with 8 traffic lanes, handling approximately 133K vehicles per day. Built in 1959 and reconstructed in 1975, the structure spans 95.1 meters.
The bridge received a Condition Grade of C (58/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (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 93 has a Condition Score of 58/100 (Grade C). Its deck is rated 6/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I 93 was built in 1959 and reconstructed in 1975, making it 67 years old. The average bridge age in the United States is 48 years.
I 93 carries approximately 133K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 95.1 meters long and located on I 93 in At Merrimac River, Essex County, Massachusetts.
No, I 93 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 is located At Merrimac River in Essex County, Massachusetts. The bridge carries I 93 over HWY Riverside DR. Its coordinates are 42.702194, -71.210106. It is maintained by State Highway Agency.
I 93 carries I 93 over HWY Riverside DR. The bridge is 95.1 meters long and was built in 1959, with reconstruction in 1975.
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.