US Bridges

I-72 (eb) over FAP 322A(US 51 Sb)

Fair

Macon County, Illinois · In Harristown · Structure no. 058006700000000

Built
1976
49 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
217 ft
3 main spans
Daily traffic
4,275
2023 count
Owner
State
State Highway Agency

About this bridge

I-72 (eb) over FAP 322A(US 51 Sb) is a steel continuous stringer/multi-beam or girder carrying I-72 (eb) over FAP 322A(US 51 Sb) in Macon County, Illinois. It was built in 1976, so it is 49 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 4,275 vehicles a day, roughly 29% of them trucks, projected to reach 4,520 by 2046. The structure is 217 ft (66.1 m) long and 42 ft wide.

Location

Open in Google Maps
CarriesI-72 (eb)
CrossesFAP 322A(US 51 Sb)
LocationIn Harristown
RouteInterstate 72
CountyMacon County
StateIllinois
Coordinates39.84129, -89.04691
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 inspectionOctober 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length217 ft (66.1 m)
Longest span106 ft (32.3 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,275 (2023)
Projected traffic4,520 by 2046
Trucks29%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 (eb) over FAP 322A(US 51 Sb) built?

It was built in 1976, making it 49 years old in 2025.

What condition is I-72 (eb) over FAP 322A(US 51 Sb) 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 October 2024.

How much traffic does I-72 (eb) over FAP 322A(US 51 Sb) carry?

About 4,275 vehicles per day (2023 count), of which roughly 29% are trucks.

How long is I-72 (eb) over FAP 322A(US 51 Sb)?

The structure is 217 ft (66.1 m) long with a longest span of 106 ft (32.3 m) and a deck 42 ft wide.

Who owns I-72 (eb) over FAP 322A(US 51 Sb)?

It is owned by the State Highway Agency.