US Bridges

I-55 SB over Icrr & Kickapoo Ovfl

Fair

Logan County, Illinois · 2.1 M E I-55/155INT · Structure no. 054005400000000

Built
1974
51 years old, rebuilt 2013
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
581 ft
5 main spans
Daily traffic
10,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 SB over Icrr & Kickapoo Ovfl is a steel continuous stringer/multi-beam or girder carrying I-55 SB over Icrr & Kickapoo Ovfl in Logan County, Illinois. It was built in 1974 and reconstructed in 2013, 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 5 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 581 ft (177.1 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55 SB
CrossesIcrr & Kickapoo Ovfl
Location2.1 M E I-55/155INT
RouteInterstate 55
CountyLogan County
StateIllinois
Coordinates40.18138, -89.3786
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length581 ft (177.1 m)
Longest span140 ft (42.7 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 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
CarriesHighway
CrossesRailroad and waterway
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 SB over Icrr & Kickapoo Ovfl built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2013.

What condition is I-55 SB over Icrr & Kickapoo Ovfl 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 over Icrr & Kickapoo Ovfl carry?

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

How long is I-55 SB over Icrr & Kickapoo Ovfl?

The structure is 581 ft (177.1 m) long with a longest span of 140 ft (42.7 m) and a deck 43 ft wide.

Who owns I-55 SB over Icrr & Kickapoo Ovfl?

It is owned by the State Highway Agency.