US Bridges

I-72 / US 36 over Long Pt. Slough Trib

Fair

Sangamon County, Illinois · 1.1M E Illioplis Int · Structure no. 084200700000000

Built
1975
50 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
48 ft
3 main spans
Daily traffic
14,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-72 / US 36 over Long Pt. Slough Trib is a concrete culvert carrying I-72 / US 36 over Long Pt. Slough Trib in Sangamon County, Illinois. It was built in 1975, so it is 50 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 14,500 vehicles a day, roughly 21% of them trucks, projected to reach 16,463 by 2046. The structure is 48 ft (14.7 m) long. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesI-72 / US 36
CrossesLong Pt. Slough Trib
Location1.1M E Illioplis Int
RouteInterstate 72
CountySangamon County
StateIllinois
Coordinates39.83652, -89.23421
Functional classRural Principal Arterial - Interstate

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 rating107.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length48 ft (14.7 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 traffic14,500 (2023)
Projected traffic16,463 by 2046
Trucks21%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-72 / US 36 over Long Pt. Slough Trib built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-72 / US 36 over Long Pt. Slough 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 July 2024.

How much traffic does I-72 / US 36 over Long Pt. Slough Trib carry?

About 14,500 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is I-72 / US 36 over Long Pt. Slough Trib?

The structure is 48 ft (14.7 m) long with a longest span of 10 ft (3.2 m).

Who owns I-72 / US 36 over Long Pt. Slough Trib?

It is owned by the State Highway Agency.