US Bridges

ST Clair Ave EB over Harding Ditch

Fair

St. Clair County, Illinois · 1.5 M W Ill 157 · Structure no. 082003300000000

Built
1959
66 years old, rebuilt 1994
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
5,900
2023 count
Owner
State
State Highway Agency

About this bridge

ST Clair Ave EB over Harding Ditch is a prestressed concrete box beam or girders - multiple carrying ST Clair Ave EB over Harding Ditch in St. Clair County, Illinois. It was built in 1959 and reconstructed in 1994, so it is 66 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 5,900 vehicles a day, roughly 3% of them trucks, projected to reach 6,060 by 2046. The structure is 52 ft (15.8 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST Clair Ave EB
CrossesHarding Ditch
Location1.5 M W Ill 157
CountySt. Clair County
StateIllinois
Coordinates38.60769, -90.07818
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating73.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span49 ft (14.9 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,900 (2023)
Projected traffic6,060 by 2046
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 ST Clair Ave EB over Harding Ditch built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1994.

What condition is ST Clair Ave EB 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 September 2024.

How much traffic does ST Clair Ave EB over Harding Ditch carry?

About 5,900 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is ST Clair Ave EB over Harding Ditch?

The structure is 52 ft (15.8 m) long with a longest span of 49 ft (14.9 m) and a deck 36 ft wide.

Who owns ST Clair Ave EB over Harding Ditch?

It is owned by the State Highway Agency.