US Bridges

FAI 255 over Hill Creek

Good

St. Clair County, Illinois · 1.5 MI S of Dupo · Structure no. 082201700000000

Built
1979
46 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete Continuous
Length
61 ft
4 main spans
Daily traffic
41,000
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255 over Hill Creek is a concrete continuous culvert carrying FAI 255 over Hill Creek in St. Clair County, Illinois. It was built in 1979, so it is 46 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 41,000 vehicles a day, roughly 13% of them trucks, projected to reach 46,056 by 2046. The structure is 61 ft (18.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFAI 255
CrossesHill Creek
Location1.5 MI S of Dupo
RouteInterstate 255
Coordinates38.48985, -90.21804
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.1 US tons
Inventory rating51.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20 + Mod
Structure length61 ft (18.5 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,000 (2023)
Projected traffic46,056 by 2046
Trucks13%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 FAI 255 over Hill Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is FAI 255 over Hill Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does FAI 255 over Hill Creek carry?

About 41,000 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is FAI 255 over Hill Creek?

The structure is 61 ft (18.5 m) long with a longest span of 16 ft (4.9 m).

Who owns FAI 255 over Hill Creek?

It is owned by the State Highway Agency.