US Bridges

FAP 322 (us 51) S. over Willow Branch Creek

Fair

Macon County, Illinois · 2 MI S of Macon · Structure no. 058012600000000

Built
2001
24 years old
Condition
Fair
inspected September 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
83 ft
1 main span
Daily traffic
5,700
2023 count
Owner
State
State Highway Agency

About this bridge

FAP 322 (us 51) S. over Willow Branch Creek is a prestressed concrete stringer/multi-beam or girder carrying FAP 322 (us 51) S. over Willow Branch Creek in Macon County, Illinois. It was built in 2001, so it is 24 years old, younger 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 5,700 vehicles a day, roughly 13% of them trucks, projected to reach 3,358 by 2046. The structure is 83 ft (25.2 m) long and 43 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesFAP 322 (us 51) S.
CrossesWillow Branch Creek
Location2 MI S of Macon
RouteU.S. Route 51
CountyMacon County
StateIllinois
Coordinates39.67841, -89.00679
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length83 ft (25.2 m)
Longest span78 ft (23.7 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2023)
Projected traffic3,358 by 2046
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 322 (us 51) S. over Willow Branch Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is FAP 322 (us 51) S. over Willow Branch Creek 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 September 2021.

How much traffic does FAP 322 (us 51) S. over Willow Branch Creek carry?

About 5,700 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is FAP 322 (us 51) S. over Willow Branch Creek?

The structure is 83 ft (25.2 m) long with a longest span of 78 ft (23.7 m) and a deck 43 ft wide.

Who owns FAP 322 (us 51) S. over Willow Branch Creek?

It is owned by the State Highway Agency.