INTERSTATE-91&RT15
INTERSTATE-91&RT15 in .12 MI North Of E Main ST, New Haven County, Connecticut received a condition grade of F (0/100). Built in 1964, the bridge carries 137K vehicles daily on INTERSTATE-91&RT15 over Willow Brook. It is classified as structurally deficient.
INTERSTATE-91&RT15 carries an F on the BridgeSafety Condition Score with 0/100 — the bottom tier of the FHWA NBI distribution. Component ratings flag the structure for near-term rehabilitation or replacement; the bridge may remain open to traffic but is on the priority list for action.
The bridge was built in 1964 and is now 62 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&RT15 carries an average daily traffic count of 136,800 vehicles, with 10 lane(s) crossing Willow 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
INTERSTATE-91&RT15 is a 62-year-old bridge located .12 MI North Of E Main ST in New Haven County, Connecticut. The bridge carries INTERSTATE-91&RT15 over Willow Brook with 10 traffic lanes, handling approximately 137K vehicles per day. Built in 1964, the structure spans 7 meters.
The bridge received a Condition Grade of F (0/100) based on Federal Highway Administration inspection data. Its deck is rated 0/9 (serious), superstructure 0/9 (serious), and substructure 0/9 (serious). 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
INTERSTATE-91&RT15 has a Condition Score of 0/100 (Grade F). Its deck is rated 0/9, superstructure 0/9, and substructure 0/9 on the NBI scale. The bridge is classified as structurally deficient.
INTERSTATE-91&RT15 was built in 1964, making it 62 years old. The average bridge age in the United States is 48 years.
INTERSTATE-91&RT15 carries approximately 137K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 7 meters long and located on INTERSTATE-91&RT15 in .12 MI North Of E Main ST, New Haven County, Connecticut.
Yes, INTERSTATE-91&RT15 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.
INTERSTATE-91&RT15 is located .12 MI North Of E Main ST in New Haven County, Connecticut. The bridge carries INTERSTATE-91&RT15 over Willow Brook. Its coordinates are 41.528428, -72.769764. It is maintained by State Highway Agency.
INTERSTATE-91&RT15 carries INTERSTATE-91&RT15 over Willow Brook. The bridge is 7 meters long and was built in 1964.
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.