US Bridges

Il 13 over Kaskaskia River

Fair

St. Clair County, Illinois · W of New Athens · Structure no. 082019800000000

Built
1972
53 years old
Condition
Fair
inspected October 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
576 ft
3 main spans
Daily traffic
6,900
2023 count
Owner
State
State Highway Agency

About this bridge

Il 13 over Kaskaskia River is a steel continuous girder and floorbeam system carrying Il 13 over Kaskaskia River in St. Clair County, Illinois. It was built in 1972, so it is 53 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 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 6,900 vehicles a day, roughly 10% of them trucks, projected to reach 7,525 by 2046. The structure is 576 ft (175.5 m) long and 43 ft wide. If it were closed, the detour would be 39.1 mi (63 km).

Location

Open in Google Maps
CarriesIl 13
CrossesKaskaskia River
LocationW of New Athens
RouteState Highway 13
CountySt. Clair County
StateIllinois
Coordinates38.32001, -89.88884
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.4 US tons
Inventory rating32.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length576 ft (175.5 m)
Longest span238 ft (72.5 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,900 (2023)
Projected traffic7,525 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.1 mi (63 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Il 13 over Kaskaskia River built?

It was built in 1972, making it 53 years old in 2025.

What condition is Il 13 over Kaskaskia River 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 October 2024.

How much traffic does Il 13 over Kaskaskia River carry?

About 6,900 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 13 over Kaskaskia River?

The structure is 576 ft (175.5 m) long with a longest span of 238 ft (72.5 m) and a deck 43 ft wide.

Who owns Il 13 over Kaskaskia River?

It is owned by the State Highway Agency.