US Bridges

I-55 SB & CD#2279 over US 51B (main St)

Fair

McLean County, Illinois · Inter I-55 & US 51B · Structure no. 057002500000000

Built
1962
63 years old, rebuilt 2010
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
210 ft
4 main spans
Daily traffic
15,850
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 SB & CD#2279 over US 51B (main St) is a steel continuous stringer/multi-beam or girder carrying I-55 SB & CD#2279 over US 51B (main St) in McLean County, Illinois. It was built in 1962 and reconstructed in 2010, 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 15,850 vehicles a day, roughly 24% of them trucks, projected to reach 15,251 by 2046. The structure is 210 ft (63.9 m) long and 120 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55 SB & CD#2279
CrossesUS 51B (main St)
LocationInter I-55 & US 51B
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.53881, -88.99617
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 rating42.5 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length210 ft (63.9 m)
Longest span57 ft (17.4 m)
Deck width120 ft (36.6 m)
Roadway width115 ft (35 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,850 (2023)
Projected traffic15,251 by 2046
Trucks24%
Lanes on structure5
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 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55 SB & CD#2279 over US 51B (main St) built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2010.

What condition is I-55 SB & CD#2279 over US 51B (main St) 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 SB & CD#2279 over US 51B (main St) carry?

About 15,850 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is I-55 SB & CD#2279 over US 51B (main St)?

The structure is 210 ft (63.9 m) long with a longest span of 57 ft (17.4 m) and a deck 120 ft wide.

Who owns I-55 SB & CD#2279 over US 51B (main St)?

It is owned by the State Highway Agency.