US Bridges

I-55 SB over Vermillion River

Fair

Livingston County, Illinois · 1.5 M N of Il 116 · Structure no. 053012800000000

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
404 ft
4 main spans
Daily traffic
10,900
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 SB over Vermillion River is a steel continuous stringer/multi-beam or girder carrying I-55 SB over Vermillion River in Livingston County, Illinois. It was built in 1975, so it is 50 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 10,900 vehicles a day, roughly 36% of them trucks, projected to reach 10,252 by 2046. The structure is 404 ft (123.1 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55 SB
CrossesVermillion River
Location1.5 M N of Il 116
RouteInterstate 55
CountyLivingston County
StateIllinois
Coordinates40.89431, -88.67141
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length404 ft (123.1 m)
Longest span110 ft (33.5 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,900 (2023)
Projected traffic10,252 by 2046
Trucks36%
Lanes on structure2
Traffic directionOne-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 SB over Vermillion River built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-55 SB over Vermillion River 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 March 2023.

How much traffic does I-55 SB over Vermillion River carry?

About 10,900 vehicles per day (2023 count), of which roughly 36% are trucks.

How long is I-55 SB over Vermillion River?

The structure is 404 ft (123.1 m) long with a longest span of 110 ft (33.5 m) and a deck 42 ft wide.

Who owns I-55 SB over Vermillion River?

It is owned by the State Highway Agency.