US Bridges

I-55 NB over Il 10 & UP RR

Fair

Logan County, Illinois · Il 10 Int- W Lincoln · Structure no. 054004700000000

Built
1974
51 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
327 ft
3 main spans
Daily traffic
13,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 NB over Il 10 & UP RR is a steel continuous stringer/multi-beam or girder carrying I-55 NB over Il 10 & UP RR in Logan County, Illinois. It was built in 1974, so it is 51 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 13,750 vehicles a day, roughly 32% of them trucks, projected to reach 13,230 by 2046. The structure is 327 ft (99.7 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55 NB
CrossesIl 10 & UP RR
LocationIl 10 Int- W Lincoln
RouteInterstate 55
CountyLogan County
StateIllinois
Coordinates40.15933, -89.41741
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating57.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20 + Mod
Structure length327 ft (99.7 m)
Longest span91 ft (27.8 m)
Deck width59 ft (17.9 m)
Roadway width55 ft (16.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,750 (2023)
Projected traffic13,230 by 2046
Trucks32%
Lanes on structure3
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 Il 10 & UP RR built?

It was built in 1974, making it 51 years old in 2025.

What condition is I-55 NB over Il 10 & UP RR 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 August 2023.

How much traffic does I-55 NB over Il 10 & UP RR carry?

About 13,750 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is I-55 NB over Il 10 & UP RR?

The structure is 327 ft (99.7 m) long with a longest span of 91 ft (27.8 m) and a deck 59 ft wide.

Who owns I-55 NB over Il 10 & UP RR?

It is owned by the State Highway Agency.