US Bridges

I-55 NB over US 24/FAP 317

Good

McLean County, Illinois · 0.41 MI W of Old 66 · Structure no. 057015300000000

Built
1977
48 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
187 ft
2 main spans
Daily traffic
10,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 NB over US 24/FAP 317 is a steel continuous stringer/multi-beam or girder carrying I-55 NB over US 24/FAP 317 in McLean County, Illinois. It was built in 1977, so it is 48 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,500 vehicles a day, roughly 31% of them trucks, projected to reach 10,353 by 2046. The structure is 187 ft (57.1 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55 NB
CrossesUS 24/FAP 317
Location0.41 MI W of Old 66
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.74172, -88.73743
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
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 rating78.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length187 ft (57.1 m)
Longest span66 ft (20.2 m)
Deck width52 ft (15.9 m)
Roadway width49 ft (14.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,500 (2023)
Projected traffic10,353 by 2046
Trucks31%
Lanes on structure2
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 NB over US 24/FAP 317 built?

It was built in 1977, making it 48 years old in 2025.

What condition is I-55 NB over US 24/FAP 317 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does I-55 NB over US 24/FAP 317 carry?

About 10,500 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is I-55 NB over US 24/FAP 317?

The structure is 187 ft (57.1 m) long with a longest span of 66 ft (20.2 m) and a deck 52 ft wide.

Who owns I-55 NB over US 24/FAP 317?

It is owned by the State Highway Agency.