US Bridges

Il 143 over Power Plant Access

Fair

Madison County, Illinois · 1.35MI W IL3/143 JCT · Structure no. 060020000000000

Built
1968
57 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
198 ft
4 main spans
Daily traffic
10,500
2023 count
Owner
State
State Highway Agency

About this bridge

Il 143 over Power Plant Access is a steel continuous stringer/multi-beam or girder carrying Il 143 over Power Plant Access in Madison County, Illinois. It was built in 1968, 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 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 10,500 vehicles a day, roughly 7% of them trucks, projected to reach 11,128 by 2046. The structure is 198 ft (60.4 m) long and 66 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesIl 143
CrossesPower Plant Access
Location1.35MI W IL3/143 JCT
RouteState Highway 143
CountyMadison County
StateIllinois
Coordinates38.86204, -90.13222
Functional classUrban Other Principal 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length198 ft (60.4 m)
Longest span55 ft (16.8 m)
Deck width66 ft (20.2 m)
Roadway width63 ft (19.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,500 (2023)
Projected traffic11,128 by 2046
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed24.2 mi (39 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 Il 143 over Power Plant Access built?

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

What condition is Il 143 over Power Plant Access 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 May 2024.

How much traffic does Il 143 over Power Plant Access carry?

About 10,500 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Il 143 over Power Plant Access?

The structure is 198 ft (60.4 m) long with a longest span of 55 ft (16.8 m) and a deck 66 ft wide.

Who owns Il 143 over Power Plant Access?

It is owned by the State Highway Agency.