US Bridges

I-55 SB over UP RR & Bus 55

Fair

Logan County, Illinois · BUS55 Int NE Lincoln · Structure no. 054006000000000

Built
1974
51 years old, rebuilt 2014
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
492 ft
3 main spans
Daily traffic
10,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 SB over UP RR & Bus 55 is a steel continuous stringer/multi-beam or girder carrying I-55 SB over UP RR & Bus 55 in Logan County, Illinois. It was built in 1974 and reconstructed in 2014, 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 10,750 vehicles a day, roughly 33% of them trucks, projected to reach 11,498 by 2046. The structure is 492 ft (149.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-55 SB
CrossesUP RR & Bus 55
LocationBUS55 Int NE Lincoln
RouteInterstate 55
CountyLogan County
StateIllinois
Coordinates40.18507, -89.32078
Functional classRural 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.3 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length492 ft (149.9 m)
Longest span183 ft (55.9 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,750 (2023)
Projected traffic11,498 by 2046
Trucks33%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
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 over UP RR & Bus 55 built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2014.

What condition is I-55 SB over UP RR & Bus 55 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 December 2024.

How much traffic does I-55 SB over UP RR & Bus 55 carry?

About 10,750 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is I-55 SB over UP RR & Bus 55?

The structure is 492 ft (149.9 m) long with a longest span of 183 ft (55.9 m) and a deck 44 ft wide.

Who owns I-55 SB over UP RR & Bus 55?

It is owned by the State Highway Agency.