US Bridges

FAP-821 (ILL-15) over Seven Mile Creek

Fair

Jefferson County, Illinois · 2 MI E Mt Vernon · Structure no. 041002700000000

Built
1957
68 years old, rebuilt 2007
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
168 ft
3 main spans
Daily traffic
4,600
2023 count
Owner
State
State Highway Agency

About this bridge

FAP-821 (ILL-15) over Seven Mile Creek is a steel continuous stringer/multi-beam or girder carrying FAP-821 (ILL-15) over Seven Mile Creek in Jefferson County, Illinois. It was built in 1957 and reconstructed in 2007, 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 4,600 vehicles a day, roughly 9% of them trucks, projected to reach 4,242 by 2046. The structure is 168 ft (51.2 m) long and 44 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFAP-821 (ILL-15)
CrossesSeven Mile Creek
Location2 MI E Mt Vernon
RouteState Highway 15
CountyJefferson County
StateIllinois
Coordinates38.31889, -88.84787
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating94.7 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 length168 ft (51.2 m)
Longest span61 ft (18.6 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,600 (2023)
Projected traffic4,242 by 2046
Trucks9%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP-821 (ILL-15) over Seven Mile Creek built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2007.

What condition is FAP-821 (ILL-15) over Seven Mile 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 November 2023.

How much traffic does FAP-821 (ILL-15) over Seven Mile Creek carry?

About 4,600 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is FAP-821 (ILL-15) over Seven Mile Creek?

The structure is 168 ft (51.2 m) long with a longest span of 61 ft (18.6 m) and a deck 44 ft wide.

Who owns FAP-821 (ILL-15) over Seven Mile Creek?

It is owned by the State Highway Agency.