US Bridges

I-55 over Trib Lake Fork

Fair

Logan County, Illinois · 2.5M NE Elkhart Int · Structure no. 054200100000000

Built
1922
103 years old, rebuilt 1974
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
36 ft
2 main spans
Daily traffic
17,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 over Trib Lake Fork is a concrete culvert carrying I-55 over Trib Lake Fork in Logan County, Illinois. It was built in 1922 and reconstructed in 1974, so it is 103 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 17,450 vehicles a day, roughly 26% of them trucks, projected to reach 17,535 by 2046. The structure is 36 ft (11.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-55
CrossesTrib Lake Fork
Location2.5M NE Elkhart Int
RouteInterstate 55
CountyLogan County
StateIllinois
Coordinates40.04478, -89.46335
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length36 ft (11.1 m)
Longest span17 ft (5.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,450 (2023)
Projected traffic17,535 by 2046
Trucks26%
Lanes on structure4
Traffic directionTwo-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 over Trib Lake Fork built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 1974.

What condition is I-55 over Trib Lake Fork 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 January 2024.

How much traffic does I-55 over Trib Lake Fork carry?

About 17,450 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I-55 over Trib Lake Fork?

The structure is 36 ft (11.1 m) long with a longest span of 17 ft (5.2 m).

Who owns I-55 over Trib Lake Fork?

It is owned by the State Highway Agency.