US Bridges

I-55 NW Bloomingto over I-74

Fair

McLean County, Illinois · I-55NB over I-74 · Structure no. 057002200000000

Built
1962
63 years old, rebuilt 2004
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
179 ft
4 main spans
Daily traffic
18,850
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 NW Bloomingto over I-74 is a steel continuous stringer/multi-beam or girder carrying I-55 NW Bloomingto over I-74 in McLean County, Illinois. It was built in 1962 and reconstructed in 2004, so it is 63 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 6 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 18,850 vehicles a day, roughly 35% of them trucks, projected to reach 18,837 by 2046. The structure is 179 ft (54.5 m) long and 79 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55 NW Bloomingto
CrossesI-74
LocationI-55NB over I-74
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.53673, -89.02442
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length179 ft (54.5 m)
Longest span52 ft (15.9 m)
Deck width79 ft (24.1 m)
Roadway width76 ft (23.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,850 (2023)
Projected traffic18,837 by 2046
Trucks35%
Lanes on structure4
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55 NW Bloomingto over I-74 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2004.

What condition is I-55 NW Bloomingto over I-74 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 February 2025.

How much traffic does I-55 NW Bloomingto over I-74 carry?

About 18,850 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is I-55 NW Bloomingto over I-74?

The structure is 179 ft (54.5 m) long with a longest span of 52 ft (15.9 m) and a deck 79 ft wide.

Who owns I-55 NW Bloomingto over I-74?

It is owned by the State Highway Agency.