US Bridges

FAS-393(CH-4) over Trib to Walnut Creek

Fair

Knox County, Illinois · W.CTR-17-T13N R4E · Structure no. 048327700000000

Built
1983
42 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
600
2022 count
Owner
County
County Highway Agency

About this bridge

FAS-393(CH-4) over Trib to Walnut Creek is a prestressed concrete box beam or girders - multiple carrying FAS-393(CH-4) over Trib to Walnut Creek in Knox County, Illinois. It was built in 1983, so it is 42 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 600 vehicles a day, roughly 13% of them trucks, projected to reach 354 by 2046. The structure is 55 ft (16.9 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFAS-393(CH-4)
CrossesTrib to Walnut Creek
LocationW.CTR-17-T13N R4E
RouteCounty Highway 0
CountyKnox County
StateIllinois
Coordinates41.11327, -90.07913
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.1 US tons
Inventory rating36.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length55 ft (16.9 m)
Longest span53 ft (16.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2022)
Projected traffic354 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 FAS-393(CH-4) over Trib to Walnut Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is FAS-393(CH-4) over Trib to Walnut 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 February 2024.

How much traffic does FAS-393(CH-4) over Trib to Walnut Creek carry?

About 600 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is FAS-393(CH-4) over Trib to Walnut Creek?

The structure is 55 ft (16.9 m) long with a longest span of 53 ft (16.1 m) and a deck 28 ft wide.

Who owns FAS-393(CH-4) over Trib to Walnut Creek?

It is owned by the County Highway Agency.