US Bridges

FAP-821 (ILL-15) over Casey Fork

Fair

Jefferson County, Illinois · Ecl Mt Vernon · Structure no. 041002600000000

Built
1957
68 years old, rebuilt 1990
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
142 ft
3 main spans
Daily traffic
6,300
2023 count
Owner
State
State Highway Agency

About this bridge

FAP-821 (ILL-15) over Casey Fork is a steel continuous stringer/multi-beam or girder carrying FAP-821 (ILL-15) over Casey Fork in Jefferson County, Illinois. It was built in 1957 and reconstructed in 1990, so it is 68 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 6,300 vehicles a day, roughly 10% of them trucks, projected to reach 6,313 by 2046. The structure is 142 ft (43.4 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesFAP-821 (ILL-15)
CrossesCasey Fork
LocationEcl Mt Vernon
RouteState Highway 15
CountyJefferson County
StateIllinois
Coordinates38.31722, -88.88593
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.2 US tons
Inventory rating56.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length142 ft (43.4 m)
Longest span51 ft (15.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2023)
Projected traffic6,313 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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-821 (ILL-15) over Casey Fork built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1990.

What condition is FAP-821 (ILL-15) over Casey Fork 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 2023.

How much traffic does FAP-821 (ILL-15) over Casey Fork carry?

About 6,300 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is FAP-821 (ILL-15) over Casey Fork?

The structure is 142 ft (43.4 m) long with a longest span of 51 ft (15.6 m) and a deck 43 ft wide.

Who owns FAP-821 (ILL-15) over Casey Fork?

It is owned by the State Highway Agency.