US Bridges

I-55/I-74 NB over Sugar Creek

Fair

McLean County, Illinois · 1.0 MI So I55 &ill 9 · Structure no. 057001100000000

Built
1963
62 years old, rebuilt 2001
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
284 ft
3 main spans
Daily traffic
21,550
2023 count
Owner
State
State Highway Agency

About this bridge

I-55/I-74 NB over Sugar Creek is a steel continuous stringer/multi-beam or girder carrying I-55/I-74 NB over Sugar Creek in McLean County, Illinois. It was built in 1963 and reconstructed in 2001, 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 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 21,550 vehicles a day, roughly 37% of them trucks, projected to reach 22,422 by 2046. The structure is 284 ft (86.5 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55/I-74 NB
CrossesSugar Creek
Location1.0 MI So I55 &ill 9
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.47097, -89.0307
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.7 US tons
Inventory rating57.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length284 ft (86.5 m)
Longest span114 ft (34.7 m)
Deck width66 ft (20 m)
Roadway width63 ft (19.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,550 (2023)
Projected traffic22,422 by 2046
Trucks37%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-55/I-74 NB over Sugar Creek built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2001.

What condition is I-55/I-74 NB over Sugar Creek 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 May 2024.

How much traffic does I-55/I-74 NB over Sugar Creek carry?

About 21,550 vehicles per day (2023 count), of which roughly 37% are trucks.

How long is I-55/I-74 NB over Sugar Creek?

The structure is 284 ft (86.5 m) long with a longest span of 114 ft (34.7 m) and a deck 66 ft wide.

Who owns I-55/I-74 NB over Sugar Creek?

It is owned by the State Highway Agency.