US Bridges

FAS 331(CH 10) over Knights Branch

Fair

Vermilion County, Illinois · 1.8 MI S of Potomac · Structure no. 092200600000000

Built
1932
93 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete
Length
64 ft
5 main spans
Daily traffic
450
2023 count
Owner
County
County Highway Agency

About this bridge

FAS 331(CH 10) over Knights Branch is a concrete culvert carrying FAS 331(CH 10) over Knights Branch in Vermilion County, Illinois. It was built in 1932, so it is 93 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 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 450 vehicles a day, roughly 8% of them trucks, projected to reach 379 by 2046. The structure is 64 ft (19.5 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesFAS 331(CH 10)
CrossesKnights Branch
Location1.8 MI S of Potomac
RouteCounty Highway 0
CountyVermilion County
StateIllinois
Coordinates40.27563, -87.80488
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating84.7 US tons
Inventory rating50.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span11 ft (3.5 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2023)
Projected traffic379 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 331(CH 10) over Knights Branch built?

It was built in 1932, making it 93 years old in 2025.

What condition is FAS 331(CH 10) over Knights Branch 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 2023.

How much traffic does FAS 331(CH 10) over Knights Branch carry?

About 450 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is FAS 331(CH 10) over Knights Branch?

The structure is 64 ft (19.5 m) long with a longest span of 11 ft (3.5 m) and a deck 28 ft wide.

Who owns FAS 331(CH 10) over Knights Branch?

It is owned by the County Highway Agency.