US Bridges

I-72 / US 36 (eb) over I-55 (sb)

Good

Sangamon County, Illinois · .25M E 6th St. · Structure no. 084007800000000

Built
1962
63 years old, rebuilt 2011
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
347 ft
3 main spans
Daily traffic
20,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-72 / US 36 (eb) over I-55 (sb) is a steel continuous stringer/multi-beam or girder carrying I-72 / US 36 (eb) over I-55 (sb) in Sangamon County, Illinois. It was built in 1962 and reconstructed in 2011, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20,450 vehicles a day, roughly 12% of them trucks, projected to reach 20,453 by 2046. The structure is 347 ft (105.8 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-72 / US 36 (eb)
CrossesI-55 (sb)
Location.25M E 6th St.
RouteInterstate 72
CountySangamon County
StateIllinois
Coordinates39.74278, -89.64064
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.8 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length347 ft (105.8 m)
Longest span153 ft (46.6 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,450 (2023)
Projected traffic20,453 by 2046
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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-72 / US 36 (eb) over I-55 (sb) built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2011.

What condition is I-72 / US 36 (eb) over I-55 (sb) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does I-72 / US 36 (eb) over I-55 (sb) carry?

About 20,450 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is I-72 / US 36 (eb) over I-55 (sb)?

The structure is 347 ft (105.8 m) long with a longest span of 153 ft (46.6 m) and a deck 37 ft wide.

Who owns I-72 / US 36 (eb) over I-55 (sb)?

It is owned by the State Highway Agency.