I355 NB & SB
Carrying I355 NB & SB over DESPLAINES RIVER VAL
.5M S OF BLUFF RD, Cook, Illinois
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
I355 NB & SB in Cook, Illinois sits above 64% of rated Illinois bridges on inventory load rating (34 t), while its 2007 build year is earlier than 12% of Cook's recorded-year cohort (1,721 bridges).
I355 NB & SB in Cook, Illinois is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 2007, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure IL:016262900000000
POST-2000 · PRESTRESS · LONG-SPAN-RUN · TIED-CTRL · HEAVY-ADT · STANDARD-LOAD · CAT-FAIR
- POST-2000 2000+
- PRESTRESS Prestressed concrete
- LONG-SPAN-RUN 35 spans
- TIED-CTRL Tied control
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: I355 NB & SB
The I355 NB & SB bridge in Cook, Illinois carries I355 NB & SB over DESPLAINES RIVER VAL. It was built in 2007, making it 19 years old today. The structure is built primarily of prestressed concrete continuous and spans 35 sections, stretching 2009.5 meters (6593 feet) end to end. Daily traffic averages 78,300 vehicles, placing it in the heavily-trafficked tier of Illinois bridges. It is owned and maintained by State Toll Authority.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 6/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How I355 NB & SB compares
Age against the county: built in 2007, earlier than 201 of Cook's 1,721 bridges with a recorded construction year (12%), against a county median build year of 1962. This is one of the newer structures in its county.
Live comparison across Illinois bridges with a recorded inventory load rating (26,904 of 26,928 rated).
I355 NB & SB vs every rated Illinois bridge
Inventory load rating (metric tons), FHWA NBI, this state
34 Top 36% higher than 64% of 26,904 bridges
rated Illinois bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Cook inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 1,721 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 2007
- Material
- Prestressed Concrete Continuous
- Number of Spans
- 35
- Structure Length
- 2009.5 m (6593 ft)
- Deck Width
- 19.4 m (64 ft)
- Owner
- State Toll Authority
- Avg Daily Traffic
- 78,300 vehicles/day
- Structure Number
- 016262900000000
Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • At 6/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether I355 NB & SB is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare I355 NB & SB against other structures in Cook and across Illinois. Illinois bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for I355 NB & SB?
I355 NB & SB in Cook, Illinois has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is I355 NB & SB inspected?
I355 NB & SB's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 78,300 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. I355 NB & SB is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for I355 NB & SB?
I355 NB & SB has an NBI inventory load rating of 34.0 metric tons.
Who is responsible for maintaining I355 NB & SB?
I355 NB & SB is owned and maintained by State Toll Authority.
How old is I355 NB & SB and does age affect safety?
I355 NB & SB was built in 2007, making it 19 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.