US Bridges

I-39 Ramp 816 SB over I-55

Fair

McLean County, Illinois · 0.35 MI W of BUS.51 · Structure no. 057021400000000

Built
1988
37 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
273 ft
2 main spans
Daily traffic
1,700
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 Ramp 816 SB over I-55 is a steel continuous stringer/multi-beam or girder carrying I-39 Ramp 816 SB over I-55 in McLean County, Illinois. It was built in 1988, so it is 37 years old, younger 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 1,700 vehicles a day, roughly 7% of them trucks, projected to reach 1,717 by 2046. The structure is 273 ft (83.2 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-39 Ramp 816 SB
CrossesI-55
Location0.35 MI W of BUS.51
CountyMcLean County
StateIllinois
Coordinates40.53893, -89.00345
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.8 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length273 ft (83.2 m)
Longest span114 ft (34.6 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2023)
Projected traffic1,717 by 2046
Trucks7%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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 I-39 Ramp 816 SB over I-55 built?

It was built in 1988, making it 37 years old in 2025.

What condition is I-39 Ramp 816 SB over I-55 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 May 2023.

How much traffic does I-39 Ramp 816 SB over I-55 carry?

About 1,700 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-39 Ramp 816 SB over I-55?

The structure is 273 ft (83.2 m) long with a longest span of 114 ft (34.6 m) and a deck 29 ft wide.

Who owns I-39 Ramp 816 SB over I-55?

It is owned by the State Highway Agency.