US Bridges

Ill 143 over Highland Lake

Fair

Madison County, Illinois · 2 M W Highland · Structure no. 060015200000000

Built
1962
63 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
88 ft
1 main span
Daily traffic
8,850
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 143 over Highland Lake is a prestressed concrete stringer/multi-beam or girder carrying Ill 143 over Highland Lake in Madison County, Illinois. It was built in 1962, so it is 63 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 8,850 vehicles a day, roughly 7% of them trucks, projected to reach 7,972 by 2046. The structure is 88 ft (26.8 m) long and 35 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesIll 143
CrossesHighland Lake
Location2 M W Highland
RouteState Highway 143
CountyMadison County
StateIllinois
Coordinates38.76423, -89.69777
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating54.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length88 ft (26.8 m)
Longest span83 ft (25.3 m)
Deck width35 ft (10.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,850 (2023)
Projected traffic7,972 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$364,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Ill 143 over Highland Lake built?

It was built in 1962, making it 63 years old in 2025.

What condition is Ill 143 over Highland Lake 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 Ill 143 over Highland Lake carry?

About 8,850 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Ill 143 over Highland Lake?

The structure is 88 ft (26.8 m) long with a longest span of 83 ft (25.3 m) and a deck 35 ft wide.

Who owns Ill 143 over Highland Lake?

It is owned by the State Highway Agency.