US Bridges

Il 3 SB Ramp F over FAI 255

Fair

St. Clair County, Illinois · N Dupo · Structure no. 082021800000000

Built
1981
44 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
881 ft
7 main spans
Daily traffic
9,250
2023 count
Owner
State
State Highway Agency

About this bridge

Il 3 SB Ramp F over FAI 255 is a steel continuous stringer/multi-beam or girder carrying Il 3 SB Ramp F over FAI 255 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 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 9,250 vehicles a day, roughly 8% of them trucks, projected to reach 3,964 by 2046. The structure is 881 ft (268.5 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIl 3 SB Ramp F
CrossesFAI 255
LocationN Dupo
RouteState Highway 3
CountySt. Clair County
StateIllinois
Coordinates38.53079, -90.19665
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length881 ft (268.5 m)
Longest span146 ft (44.5 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,250 (2023)
Projected traffic3,964 by 2046
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 3 SB Ramp F over FAI 255 built?

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

What condition is Il 3 SB Ramp F over FAI 255 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 January 2023.

How much traffic does Il 3 SB Ramp F over FAI 255 carry?

About 9,250 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Il 3 SB Ramp F over FAI 255?

The structure is 881 ft (268.5 m) long with a longest span of 146 ft (44.5 m) and a deck 29 ft wide.

Who owns Il 3 SB Ramp F over FAI 255?

It is owned by the State Highway Agency.