US Bridges

I-72 / US 36 (eb) over 6th ST / Bus 55

Fair

Sangamon County, Illinois · S Edge Springfield · Structure no. 084007700000000

Built
1963
62 years old, rebuilt 2019
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
193 ft
4 main spans
Daily traffic
20,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-72 / US 36 (eb) over 6th ST / Bus 55 is a steel continuous stringer/multi-beam or girder carrying I-72 / US 36 (eb) over 6th ST / Bus 55 in Sangamon County, Illinois. It was built in 1963 and reconstructed in 2019, so it is 62 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 20,450 vehicles a day, roughly 12% of them trucks, projected to reach 20,453 by 2046. The structure is 193 ft (58.8 m) long and 53 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)
Crosses6th ST / Bus 55
LocationS Edge Springfield
RouteInterstate 72
CountySangamon County
StateIllinois
Coordinates39.74271, -89.6447
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length193 ft (58.8 m)
Longest span63 ft (19.2 m)
Deck width53 ft (16.3 m)
Roadway width50 ft (15.2 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 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-72 / US 36 (eb) over 6th ST / Bus 55 built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2019.

What condition is I-72 / US 36 (eb) over 6th ST / Bus 55 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 2024.

How much traffic does I-72 / US 36 (eb) over 6th ST / Bus 55 carry?

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

How long is I-72 / US 36 (eb) over 6th ST / Bus 55?

The structure is 193 ft (58.8 m) long with a longest span of 63 ft (19.2 m) and a deck 53 ft wide.

Who owns I-72 / US 36 (eb) over 6th ST / Bus 55?

It is owned by the State Highway Agency.