US Bridges

Il 4 (main St.) over Polecat CR Tributary

Good

Sangamon County, Illinois · .5M S Mansion-Chathm · Structure no. 084201600000000

Built
1978
47 years old
Condition
Good
inspected May 2024
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
18,500
2023 count
Owner
State
State Highway Agency

About this bridge

Il 4 (main St.) over Polecat CR Tributary is a concrete continuous culvert carrying Il 4 (main St.) over Polecat CR Tributary in Sangamon 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 18,500 vehicles a day, roughly 3% of them trucks, projected to reach 9,090 by 2046. The structure is 23 ft (7 m) long. If it were closed, the detour would be 8.7 mi (14 km).

CarriesIl 4 (main St.)
CrossesPolecat CR Tributary
Location.5M S Mansion-Chathm
RouteState Highway 4
Coordinates39.69081, -89.70485
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating98.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,500 (2023)
Projected traffic9,090 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 (main St.) over Polecat CR Tributary built?

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

What condition is Il 4 (main St.) over Polecat CR Tributary in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does Il 4 (main St.) over Polecat CR Tributary carry?

About 18,500 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Il 4 (main St.) over Polecat CR Tributary?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3.2 m).

Who owns Il 4 (main St.) over Polecat CR Tributary?

It is owned by the State Highway Agency.