I-355 NB & SB
I-355 NB & SB in 1.1 M.E. Of Il-53, DuPage County, Illinois received a condition grade of B (67/100). Built in 1989, the bridge carries 147K vehicles daily on I-355 NB & SB over US-34.
I-355 NB & SB carries a B on the BridgeSafety Condition Score with 67/100. 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 1989, making it 37 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. I-355 NB & SB carries an average daily traffic count of 147,200 vehicles, with 7 lane(s) crossing US-34. The owning agency is State Toll Authority; 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-355 NB & SB is a 37-year-old bridge located 1.1 M.E. Of Il-53 in DuPage County, Illinois. The bridge carries I-355 NB & SB over US-34 with 7 traffic lanes, handling approximately 147K vehicles per day. Built in 1989, the structure spans 57.9 meters.
The bridge received a Condition Grade of B (67/100) 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 Toll Authority.
Location Map
Frequently Asked Questions
I-355 NB & SB has a Condition Score of 67/100 (Grade B). 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-355 NB & SB was built in 1989, making it 37 years old. The average bridge age in the United States is 48 years.
I-355 NB & SB carries approximately 147K vehicles per day (average daily traffic). The bridge has 7 traffic lanes. It is 57.9 meters long and located on I-355 NB & SB in 1.1 M.E. Of Il-53, DuPage County, Illinois.
No, I-355 NB & 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-355 NB & SB is located 1.1 M.E. Of Il-53 in DuPage County, Illinois. The bridge carries I-355 NB & SB over US-34. Its coordinates are 41.803531, -88.055961. It is maintained by State Toll Authority.
I-355 NB & SB carries I-355 NB & SB over US-34. The bridge is 57.9 meters long and was built in 1989.
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.