US Bridges

FAP 323(EB)(US 36) over FAP 322(US 51)

Fair

Macon County, Illinois · In Harristown · Structure no. 058010700000000

Built
1976
49 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
283 ft
2 main spans
Daily traffic
4,350
2023 count
Owner
State
State Highway Agency

About this bridge

FAP 323(EB)(US 36) over FAP 322(US 51) is a steel continuous stringer/multi-beam or girder carrying FAP 323(EB)(US 36) over FAP 322(US 51) 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 4,350 vehicles a day, roughly 10% of them trucks, projected to reach 2,399 by 2046. The structure is 283 ft (86.3 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAP 323(EB)(US 36)
CrossesFAP 322(US 51)
LocationIn Harristown
RouteU.S. Route 36
CountyMacon County
StateIllinois
Coordinates39.8378, -89.04572
Functional classUrban Other Principal Arterial

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.
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 inspectionAugust 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 alignment8: Equal to present desirable criteria
Operating rating83.9 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length283 ft (86.3 m)
Longest span141 ft (43.1 m)
Deck width60 ft (18.3 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic4,350 (2023)
Projected traffic2,399 by 2046
Trucks10%
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

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 FAP 323(EB)(US 36) over FAP 322(US 51) built?

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

What condition is FAP 323(EB)(US 36) over FAP 322(US 51) 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 August 2024.

How much traffic does FAP 323(EB)(US 36) over FAP 322(US 51) carry?

About 4,350 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is FAP 323(EB)(US 36) over FAP 322(US 51)?

The structure is 283 ft (86.3 m) long with a longest span of 141 ft (43.1 m) and a deck 60 ft wide.

Who owns FAP 323(EB)(US 36) over FAP 322(US 51)?

It is owned by the State Highway Agency.