US Bridges

FAI 255 NB over Harding Ditch North

Fair

St. Clair County, Illinois · 1.9MI N FAI 64 · Structure no. 082024500000000

Built
1985
40 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
347 ft
3 main spans
Daily traffic
21,750
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255 NB over Harding Ditch North is a steel continuous stringer/multi-beam or girder carrying FAI 255 NB over Harding Ditch North in St. Clair County, Illinois. It was built in 1985, so it is 40 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 21,750 vehicles a day, roughly 15% of them trucks, projected to reach 21,917 by 2046. The structure is 347 ft (105.8 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAI 255 NB
CrossesHarding Ditch North
Location1.9MI N FAI 64
RouteInterstate 255
CountySt. Clair County
StateIllinois
Coordinates38.64007, -90.05248
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 protection7 GoodSome minor problems.
Last inspectionJanuary 2025
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.2 US tons
Inventory rating55.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length347 ft (105.8 m)
Longest span113 ft (34.4 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,750 (2023)
Projected traffic21,917 by 2046
Trucks15%
Lanes on structure3
Traffic directionOne-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 NB over Harding Ditch North built?

It was built in 1985, making it 40 years old in 2025.

What condition is FAI 255 NB over Harding Ditch North 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 2025.

How much traffic does FAI 255 NB over Harding Ditch North carry?

About 21,750 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is FAI 255 NB over Harding Ditch North?

The structure is 347 ft (105.8 m) long with a longest span of 113 ft (34.4 m) and a deck 59 ft wide.

Who owns FAI 255 NB over Harding Ditch North?

It is owned by the State Highway Agency.