US Bridges

I-55/I-74 SB over NS Railway & White Oak R

Fair

McLean County, Illinois · 3.8 M SW of Rt 51 · Structure no. 057001900000000

Built
1963
62 years old, rebuilt 1999
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
451 ft
5 main spans
Daily traffic
21,050
2023 count
Owner
State
State Highway Agency

About this bridge

I-55/I-74 SB over NS Railway & White Oak R is a steel continuous stringer/multi-beam or girder carrying I-55/I-74 SB over NS Railway & White Oak R in McLean County, Illinois. It was built in 1963 and reconstructed in 1999, so it is 62 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 21,050 vehicles a day, roughly 38% of them trucks, projected to reach 21,463 by 2046. The structure is 451 ft (137.4 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55/I-74 SB
CrossesNS Railway & White Oak R
Location3.8 M SW of Rt 51
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.5028, -89.02857
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating70.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length451 ft (137.4 m)
Longest span100 ft (30.6 m)
Deck width65 ft (19.8 m)
Roadway width62 ft (18.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,050 (2023)
Projected traffic21,463 by 2046
Trucks38%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1.9 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55/I-74 SB over NS Railway & White Oak R built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1999.

What condition is I-55/I-74 SB over NS Railway & White Oak R in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does I-55/I-74 SB over NS Railway & White Oak R carry?

About 21,050 vehicles per day (2023 count), of which roughly 38% are trucks.

How long is I-55/I-74 SB over NS Railway & White Oak R?

The structure is 451 ft (137.4 m) long with a longest span of 100 ft (30.6 m) and a deck 65 ft wide.

Who owns I-55/I-74 SB over NS Railway & White Oak R?

It is owned by the State Highway Agency.