US Bridges

Il 4 over Macoupin CR Trib

Fair

Macoupin County, Illinois · .1M S Il 108 · Structure no. 059200300000000

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
4,450
2023 count
Owner
State
State Highway Agency

About this bridge

Il 4 over Macoupin CR Trib is a concrete culvert carrying Il 4 over Macoupin CR Trib in Macoupin County, Illinois. It was built in 1960, so it is 65 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 4,450 vehicles a day, roughly 5% of them trucks, projected to reach 4,242 by 2046. The structure is 29 ft (8.9 m) long. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesIl 4
CrossesMacoupin CR Trib
Location.1M S Il 108
RouteState Highway 4
CountyMacoupin County
StateIllinois
Coordinates39.27583, -89.86896
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating101.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length29 ft (8.9 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,450 (2023)
Projected traffic4,242 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 4 over Macoupin CR Trib built?

It was built in 1960, making it 65 years old in 2025.

What condition is Il 4 over Macoupin CR Trib 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 April 2023.

How much traffic does Il 4 over Macoupin CR Trib carry?

About 4,450 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Il 4 over Macoupin CR Trib?

The structure is 29 ft (8.9 m) long with a longest span of 13 ft (4 m).

Who owns Il 4 over Macoupin CR Trib?

It is owned by the State Highway Agency.