I- 55
I- 55 in 0.6 M NE Of Il 83, DuPage County, Illinois received a condition grade of B (62/100). Built in 1959, the bridge carries 150K vehicles daily on I- 55 over Madison ST.
I- 55 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- 55 carries an average daily traffic count of 150,000 vehicles, with 6 lane(s) crossing Madison ST. 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- 55 is a 67-year-old bridge located 0.6 M NE Of Il 83 in DuPage County, Illinois. The bridge carries I- 55 over Madison ST with 6 traffic lanes, handling approximately 150K vehicles per day. Built in 1959 and reconstructed in 1996, the structure spans 52.4 meters.
The bridge received a Condition Grade of B (62/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 5/9 (fair), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I- 55 has a Condition Score of 62/100 (Grade B). Its deck is rated 7/9, superstructure 5/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
I- 55 was built in 1959 and reconstructed in 1996, making it 67 years old. The average bridge age in the United States is 48 years.
I- 55 carries approximately 150K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 52.4 meters long and located on I- 55 in 0.6 M NE Of Il 83, DuPage County, Illinois.
No, I- 55 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- 55 is located 0.6 M NE Of Il 83 in DuPage County, Illinois. The bridge carries I- 55 over Madison ST. Its coordinates are 41.747261, -87.935128. It is maintained by State Highway Agency.
I- 55 carries I- 55 over Madison ST. The bridge is 52.4 meters long and was built in 1959, with reconstruction in 1996.
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.