US Bridges

Overpass RD / TR 4 over I-72 / US 36

Fair

Sangamon County, Illinois · 1.4M E Sangamon R. · Structure no. 084015400000000

Built
1974
51 years old, rebuilt 2014
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
258 ft
2 main spans
Daily traffic
3,000
2023 count
Owner
State
State Highway Agency

About this bridge

Overpass RD / TR 4 over I-72 / US 36 is a steel continuous stringer/multi-beam or girder carrying Overpass RD / TR 4 over I-72 / US 36 in Sangamon County, Illinois. It was built in 1974 and reconstructed in 2014, so it is 51 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 3,000 vehicles a day, roughly 9% of them trucks, projected to reach 2,475 by 2046. The structure is 258 ft (78.6 m) long and 68 ft wide.

Location

Open in Google Maps
CarriesOverpass RD / TR 4
CrossesI-72 / US 36
Location1.4M E Sangamon R.
CountySangamon County
StateIllinois
Coordinates39.83816, -89.52064
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length258 ft (78.6 m)
Longest span99 ft (30.2 m)
Deck width68 ft (20.7 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2023)
Projected traffic2,475 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Overpass RD / TR 4 over I-72 / US 36 built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2014.

What condition is Overpass RD / TR 4 over I-72 / US 36 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 December 2023.

How much traffic does Overpass RD / TR 4 over I-72 / US 36 carry?

About 3,000 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Overpass RD / TR 4 over I-72 / US 36?

The structure is 258 ft (78.6 m) long with a longest span of 99 ft (30.2 m) and a deck 68 ft wide.

Who owns Overpass RD / TR 4 over I-72 / US 36?

It is owned by the State Highway Agency.