US Bridges

I-55/70 & US 40 WB over Drainage Canal

Fair

St. Clair County, Illinois · 1/2 MI E of E ST Lou · Structure no. 082001800000000

Built
1960
65 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
125 ft
3 main spans
Daily traffic
33,250
2024 count
Owner
State
State Highway Agency

About this bridge

I-55/70 & US 40 WB over Drainage Canal is a steel continuous stringer/multi-beam or girder carrying I-55/70 & US 40 WB over Drainage Canal in St. Clair County, Illinois. It was built in 1960, so it is 65 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 33,250 vehicles a day, roughly 18% of them trucks, projected to reach 33,987 by 2046. The structure is 125 ft (38.1 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55/70 & US 40 WB
CrossesDrainage Canal
Location1/2 MI E of E ST Lou
RouteInterstate 55
CountySt. Clair County
StateIllinois
Coordinates38.64252, -90.13188
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.1 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length125 ft (38.1 m)
Longest span44 ft (13.4 m)
Deck width56 ft (17.1 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,250 (2024)
Projected traffic33,987 by 2046
Trucks18%
Lanes on structure3
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-55/70 & US 40 WB over Drainage Canal built?

It was built in 1960, making it 65 years old in 2025.

What condition is I-55/70 & US 40 WB over Drainage Canal 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 May 2023.

How much traffic does I-55/70 & US 40 WB over Drainage Canal carry?

About 33,250 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is I-55/70 & US 40 WB over Drainage Canal?

The structure is 125 ft (38.1 m) long with a longest span of 44 ft (13.4 m) and a deck 56 ft wide.

Who owns I-55/70 & US 40 WB over Drainage Canal?

It is owned by the State Highway Agency.