US Bridges

WB I-474 over Illinois River T&p RR

Fair

Tazewell County, Illinois · SW of Creve Coeur · Structure no. 090010900000000

Built
1975
50 years old
Condition
Fair
inspected April 2023
Type
Truss - Thru
Steel Continuous
Length
3,477 ft
3 main spans
Daily traffic
12,800
2023 count
Owner
State
State Highway Agency

About this bridge

WB I-474 over Illinois River T&p RR is a steel continuous truss - thru carrying WB I-474 over Illinois River T&p RR in Tazewell 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 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 12,800 vehicles a day, roughly 14% of them trucks, projected to reach 14,039 by 2046. The structure is 3,477 ft (1,059.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWB I-474
CrossesIllinois River T&p RR
LocationSW of Creve Coeur
RouteInterstate 474
CountyTazewell County
StateIllinois
Coordinates40.63931, -89.62762
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.
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
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.5 US tons
Inventory rating31.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+13 approach)
Design loadHS 20 + Mod
Structure length3,477 ft (1,059.8 m)
Longest span540 ft (164.6 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,800 (2023)
Projected traffic14,039 by 2046
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was WB I-474 over Illinois River T&p RR built?

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

What condition is WB I-474 over Illinois River T&p 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 April 2023.

How much traffic does WB I-474 over Illinois River T&p RR carry?

About 12,800 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is WB I-474 over Illinois River T&p RR?

The structure is 3,477 ft (1,059.8 m) long with a longest span of 540 ft (164.6 m) and a deck 43 ft wide.

Who owns WB I-474 over Illinois River T&p RR?

It is owned by the State Highway Agency.