US Bridges

FAI 255 over Ill 15

Poor

St. Clair County, Illinois · 1.3 MI S of State ST · Structure no. 082023100000000

Built
1981
44 years old
Condition
Poor
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
203 ft
2 main spans
Daily traffic
44,300
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255 over Ill 15 is a steel continuous stringer/multi-beam or girder carrying FAI 255 over Ill 15 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 44,300 vehicles a day, roughly 16% of them trucks, projected to reach 48,278 by 2046. The structure is 203 ft (61.9 m) long and 148 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAI 255
CrossesIll 15
Location1.3 MI S of State ST
RouteInterstate 255
CountySt. Clair County
StateIllinois
Coordinates38.5824, -90.10784
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.1 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length203 ft (61.9 m)
Longest span105 ft (32 m)
Deck width148 ft (45 m)
Roadway width138 ft (42.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,300 (2023)
Projected traffic48,278 by 2046
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 Ill 15 built?

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

What condition is FAI 255 over Ill 15 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2024.

How much traffic does FAI 255 over Ill 15 carry?

About 44,300 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is FAI 255 over Ill 15?

The structure is 203 ft (61.9 m) long with a longest span of 105 ft (32 m) and a deck 148 ft wide.

Who owns FAI 255 over Ill 15?

It is owned by the State Highway Agency.