US Bridges

Ill 163 over N Prairie Dupont CR

Good

St. Clair County, Illinois · 2.6 M S JCT Ill 157 · Structure no. 082010400000000

Built
1959
66 years old, rebuilt 1990
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
118 ft
2 main spans
Daily traffic
3,150
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 163 over N Prairie Dupont CR is a steel continuous stringer/multi-beam or girder carrying Ill 163 over N Prairie Dupont CR in St. Clair County, Illinois. It was built in 1959 and reconstructed in 1990, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,150 vehicles a day, roughly 6% of them trucks, projected to reach 3,030 by 2046. The structure is 118 ft (36 m) long and 35 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesIll 163
CrossesN Prairie Dupont CR
Location2.6 M S JCT Ill 157
RouteState Highway 163
CountySt. Clair County
StateIllinois
Coordinates38.52424, -90.10502
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length118 ft (36 m)
Longest span63 ft (19.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,150 (2023)
Projected traffic3,030 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 Ill 163 over N Prairie Dupont CR built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1990.

What condition is Ill 163 over N Prairie Dupont CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Ill 163 over N Prairie Dupont CR carry?

About 3,150 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Ill 163 over N Prairie Dupont CR?

The structure is 118 ft (36 m) long with a longest span of 63 ft (19.1 m) and a deck 35 ft wide.

Who owns Ill 163 over N Prairie Dupont CR?

It is owned by the State Highway Agency.