US Bridges

I-55/70 WB over A&srr

Fair

Madison County, Illinois · 0.75 MI E of Il 111 · Structure no. 060020900000000

Built
1980
45 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
411 ft
5 main spans
Daily traffic
26,800
2023 count
Owner
State
State Highway Agency

About this bridge

I-55/70 WB over A&srr is a steel continuous stringer/multi-beam or girder carrying I-55/70 WB over A&srr in Madison County, Illinois. It was built in 1980, so it is 45 years old, younger 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 26,800 vehicles a day, roughly 19% of them trucks, projected to reach 27,660 by 2046. The structure is 411 ft (125.3 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-55/70 WB
CrossesA&srr
Location0.75 MI E of Il 111
RouteInterstate 55
CountyMadison County
StateIllinois
Coordinates38.66259, -90.07798
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.3 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length411 ft (125.3 m)
Longest span100 ft (30.5 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,800 (2023)
Projected traffic27,660 by 2046
Trucks19%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55/70 WB over A&srr built?

It was built in 1980, making it 45 years old in 2025.

What condition is I-55/70 WB over A&srr 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 December 2024.

How much traffic does I-55/70 WB over A&srr carry?

About 26,800 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is I-55/70 WB over A&srr?

The structure is 411 ft (125.3 m) long with a longest span of 100 ft (30.5 m) and a deck 59 ft wide.

Who owns I-55/70 WB over A&srr?

It is owned by the State Highway Agency.