US Bridges

US 50 over Kaskaskia River

Fair

Clinton County, Illinois · At Carlyle · Structure no. 014006100000000

Built
1978
47 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
293 ft
3 main spans
Daily traffic
5,850
2023 count
Owner
State
State Highway Agency

About this bridge

US 50 over Kaskaskia River is a steel continuous stringer/multi-beam or girder carrying US 50 over Kaskaskia River in Clinton County, Illinois. It was built in 1978, so it is 47 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 5,850 vehicles a day, roughly 14% of them trucks, projected to reach 7,150 by 2046. The structure is 293 ft (89.3 m) long and 40 ft wide. If it were closed, the detour would be 44.1 mi (71 km).

Location

Open in Google Maps
CarriesUS 50
CrossesKaskaskia River
LocationAt Carlyle
RouteU.S. Route 50
CountyClinton County
StateIllinois
Coordinates38.61013, -89.35626
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
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating94.7 US tons
Inventory rating56.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length293 ft (89.3 m)
Longest span123 ft (37.5 m)
Deck width40 ft (12.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,850 (2023)
Projected traffic7,150 by 2046
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.1 mi (71 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 50 over Kaskaskia River built?

It was built in 1978, making it 47 years old in 2025.

What condition is US 50 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 July 2023.

How much traffic does US 50 over Kaskaskia River carry?

About 5,850 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 50 over Kaskaskia River?

The structure is 293 ft (89.3 m) long with a longest span of 123 ft (37.5 m) and a deck 40 ft wide.

Who owns US 50 over Kaskaskia River?

It is owned by the State Highway Agency.