US Bridges

FAI 255 over P.Dupont&blue Waters

Fair

St. Clair County, Illinois · .50 M SW of Ill 157 · Structure no. 082022100000000

Built
1981
44 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
2,369 ft
14 main spans
Daily traffic
31,400
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255 over P.Dupont&blue Waters is a steel continuous stringer/multi-beam or girder carrying FAI 255 over P.Dupont&blue Waters in St. Clair County, Illinois. It was built in 1981, so it is 44 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 31,400 vehicles a day, roughly 17% of them trucks, projected to reach 33,330 by 2046. The structure is 2,369 ft (722.1 m) long and 121 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFAI 255
CrossesP.Dupont&blue Waters
Location.50 M SW of Ill 157
RouteInterstate 255
CountySt. Clair County
StateIllinois
Coordinates38.54562, -90.17004
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans14
Design loadHS 20 + Mod
Structure length2,369 ft (722.1 m)
Longest span203 ft (61.9 m)
Deck width121 ft (36.9 m)
Roadway width112 ft (34.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,400 (2023)
Projected traffic33,330 by 2046
Trucks17%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 P.Dupont&blue Waters built?

It was built in 1981, making it 44 years old in 2025.

What condition is FAI 255 over P.Dupont&blue Waters 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 May 2023.

How much traffic does FAI 255 over P.Dupont&blue Waters carry?

About 31,400 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is FAI 255 over P.Dupont&blue Waters?

The structure is 2,369 ft (722.1 m) long with a longest span of 203 ft (61.9 m) and a deck 121 ft wide.

Who owns FAI 255 over P.Dupont&blue Waters?

It is owned by the State Highway Agency.