US Bridges

US 51-FAP322 over Chstnt-Cnic-Oak-Alley

Fair

Perry County, Illinois · Near Downtwn Duquoin · Structure no. 073003300000000

Built
1997
28 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
806 ft
15 main spans
Daily traffic
4,400
2023 count
Owner
State
State Highway Agency

About this bridge

US 51-FAP322 over Chstnt-Cnic-Oak-Alley is a prestressed concrete continuous stringer/multi-beam or girder carrying US 51-FAP322 over Chstnt-Cnic-Oak-Alley in Perry County, Illinois. It was built in 1997, so it is 28 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 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 4,400 vehicles a day, roughly 7% of them trucks, projected to reach 4,394 by 2046. The structure is 806 ft (245.7 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 51-FAP322
CrossesChstnt-Cnic-Oak-Alley
LocationNear Downtwn Duquoin
RouteU.S. Route 51
CountyPerry County
StateIllinois
Coordinates38.00997, -89.24155
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.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.8 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans15
Design loadHS 20
Structure length806 ft (245.7 m)
Longest span65 ft (19.8 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,400 (2023)
Projected traffic4,394 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
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 US 51-FAP322 over Chstnt-Cnic-Oak-Alley built?

It was built in 1997, making it 28 years old in 2025.

What condition is US 51-FAP322 over Chstnt-Cnic-Oak-Alley 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 January 2024.

How much traffic does US 51-FAP322 over Chstnt-Cnic-Oak-Alley carry?

About 4,400 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 51-FAP322 over Chstnt-Cnic-Oak-Alley?

The structure is 806 ft (245.7 m) long with a longest span of 65 ft (19.8 m) and a deck 33 ft wide.

Who owns US 51-FAP322 over Chstnt-Cnic-Oak-Alley?

It is owned by the State Highway Agency.