US Bridges

FAI 64 WB over Harding Ditch

Fair

St. Clair County, Illinois · 1.05 MI E of Ill 111 · Structure no. 082017000000000

Built
1968
57 years old, rebuilt 2012
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
111 ft
3 main spans
Daily traffic
37,450
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 64 WB over Harding Ditch is a steel continuous stringer/multi-beam or girder carrying FAI 64 WB over Harding Ditch in St. Clair County, Illinois. It was built in 1968 and reconstructed in 2012, so it is 57 years old, older 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 37,450 vehicles a day, roughly 14% of them trucks, projected to reach 44,250 by 2046. The structure is 111 ft (33.9 m) long and 105 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesFAI 64 WB
CrossesHarding Ditch
Location1.05 MI E of Ill 111
RouteInterstate 64
CountySt. Clair County
StateIllinois
Coordinates38.61877, -90.07226
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length111 ft (33.9 m)
Longest span41 ft (12.4 m)
Deck width105 ft (31.9 m)
Roadway width101 ft (30.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,450 (2023)
Projected traffic44,250 by 2046
Trucks14%
Lanes on structure7
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was FAI 64 WB over Harding Ditch built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2012.

What condition is FAI 64 WB over Harding Ditch 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 February 2023.

How much traffic does FAI 64 WB over Harding Ditch carry?

About 37,450 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is FAI 64 WB over Harding Ditch?

The structure is 111 ft (33.9 m) long with a longest span of 41 ft (12.4 m) and a deck 105 ft wide.

Who owns FAI 64 WB over Harding Ditch?

It is owned by the State Highway Agency.