INTERSTATE-91
INTERSTATE-91 in 0.2 MI S Of Route 17, New Haven County, Connecticut received a condition grade of C (58/100). Built in 1965, the bridge carries 129K vehicles daily on INTERSTATE-91 over Amtrak Railroad.
INTERSTATE-91 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 1965 and is now 61 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. INTERSTATE-91 carries an average daily traffic count of 129,400 vehicles, with 9 lane(s) crossing Amtrak Railroad. 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
INTERSTATE-91 is a 61-year-old bridge located 0.2 MI S Of Route 17 in New Haven County, Connecticut. The bridge carries INTERSTATE-91 over Amtrak Railroad with 9 traffic lanes, handling approximately 129K vehicles per day. Built in 1965, the structure spans 83.1 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 5/9 (fair), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
INTERSTATE-91 has a Condition Score of 58/100 (Grade C). Its deck is rated 6/9, superstructure 5/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
INTERSTATE-91 was built in 1965, making it 61 years old. The average bridge age in the United States is 48 years.
INTERSTATE-91 carries approximately 129K vehicles per day (average daily traffic). The bridge has 9 traffic lanes. It is 83.1 meters long and located on INTERSTATE-91 in 0.2 MI S Of Route 17, New Haven County, Connecticut.
No, INTERSTATE-91 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
INTERSTATE-91 is located 0.2 MI S Of Route 17 in New Haven County, Connecticut. The bridge carries INTERSTATE-91 over Amtrak Railroad. Its coordinates are 41.322531, -72.885117. It is maintained by State Highway Agency.
INTERSTATE-91 carries INTERSTATE-91 over Amtrak Railroad. The bridge is 83.1 meters long and was built in 1965.
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.