I 495 SB
I 495 SB in 0.7 MI No Rt 110, Middlesex County, Massachusetts received a condition grade of B (62/100). Built in 1959, the bridge carries 129K vehicles daily on I 495 SB over Water River Meadow Brook.
I 495 SB carries a B on the BridgeSafety Condition Score with 62/100. Most component ratings are solid; one or two may show wear consistent with the structure’s age, but the bridge is not flagged as structurally deficient.
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 495 SB carries an average daily traffic count of 128,820 vehicles, with 5 lane(s) crossing Water River Meadow Brook. 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 495 SB is a 67-year-old bridge located 0.7 MI No Rt 110 in Middlesex County, Massachusetts. The bridge carries I 495 SB over Water River Meadow Brook with 5 traffic lanes, handling approximately 129K vehicles per day. Built in 1959 and reconstructed in 1975, the structure spans 13.4 meters.
The bridge received a Condition Grade of B (62/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 7/9 (good), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I 495 SB has a Condition Score of 62/100 (Grade B). Its deck is rated 6/9, superstructure 7/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I 495 SB 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 495 SB carries approximately 129K vehicles per day (average daily traffic). The bridge has 5 traffic lanes. It is 13.4 meters long and located on I 495 SB in 0.7 MI No Rt 110, Middlesex County, Massachusetts.
No, I 495 SB 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 495 SB is located 0.7 MI No Rt 110 in Middlesex County, Massachusetts. The bridge carries I 495 SB over Water River Meadow Brook. Its coordinates are 42.607103, -71.332586. It is maintained by State Highway Agency.
I 495 SB carries I 495 SB over Water River Meadow Brook. The bridge is 13.4 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.