US Bridges

I-72 / US 36 (eb) over Long Point Slough

Fair

Sangamon County, Illinois · 1.5M E Illioplis Int · Structure no. 084016300000000

Built
1975
50 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
158 ft
3 main spans
Daily traffic
7,250
2023 count
Owner
State
State Highway Agency

About this bridge

I-72 / US 36 (eb) over Long Point Slough is a steel continuous stringer/multi-beam or girder carrying I-72 / US 36 (eb) over Long Point Slough 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 7,250 vehicles a day, roughly 21% of them trucks, projected to reach 8,232 by 2046. The structure is 158 ft (48.2 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-72 / US 36 (eb)
CrossesLong Point Slough
Location1.5M E Illioplis Int
RouteInterstate 72
CountySangamon County
StateIllinois
Coordinates39.83651, -89.22581
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.8 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length158 ft (48.2 m)
Longest span57 ft (17.3 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,250 (2023)
Projected traffic8,232 by 2046
Trucks21%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 (eb) over Long Point Slough built?

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

What condition is I-72 / US 36 (eb) over Long Point Slough 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 September 2024.

How much traffic does I-72 / US 36 (eb) over Long Point Slough carry?

About 7,250 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is I-72 / US 36 (eb) over Long Point Slough?

The structure is 158 ft (48.2 m) long with a longest span of 57 ft (17.3 m) and a deck 42 ft wide.

Who owns I-72 / US 36 (eb) over Long Point Slough?

It is owned by the State Highway Agency.