US Bridges

I-270 EB over St. Thomas RD NSRR

Fair

Madison County, Illinois · 1/2 MI E of Il 3 · Structure no. 060004000000000

Built
1962
63 years old, rebuilt 1997
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
249 ft
4 main spans
Daily traffic
22,600
2023 count
Owner
State
State Highway Agency

About this bridge

I-270 EB over St. Thomas RD NSRR is a steel continuous stringer/multi-beam or girder carrying I-270 EB over St. Thomas RD NSRR in Madison County, Illinois. It was built in 1962 and reconstructed in 1997, so it is 63 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 22,600 vehicles a day, roughly 21% of them trucks, projected to reach 24,931 by 2046. The structure is 249 ft (75.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-270 EB
CrossesSt. Thomas RD NSRR
Location1/2 MI E of Il 3
RouteInterstate 270
CountyMadison County
StateIllinois
Coordinates38.76582, -90.11575
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length249 ft (75.9 m)
Longest span69 ft (20.9 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,600 (2023)
Projected traffic24,931 by 2046
Trucks21%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-270 EB over St. Thomas RD NSRR built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1997.

What condition is I-270 EB over St. Thomas RD NSRR 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-270 EB over St. Thomas RD NSRR carry?

About 22,600 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is I-270 EB over St. Thomas RD NSRR?

The structure is 249 ft (75.9 m) long with a longest span of 69 ft (20.9 m) and a deck 44 ft wide.

Who owns I-270 EB over St. Thomas RD NSRR?

It is owned by the State Highway Agency.