US Bridges

I-39 Ramp over Linden Road

Fair

Winnebago County, Illinois · .25 MI S of US20 · Structure no. 101013700000000

Built
1981
44 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
132 ft
1 main span
Daily traffic
4,650
2022 count
Owner
State
State Highway Agency

About this bridge

I-39 Ramp over Linden Road is a steel stringer/multi-beam or girder carrying I-39 Ramp over Linden Road in Winnebago County, Illinois. It was built in 1981, so it is 44 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 4,650 vehicles a day, roughly 22% of them trucks, projected to reach 4,545 by 2046. The structure is 132 ft (40.2 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-39 Ramp
CrossesLinden Road
Location.25 MI S of US20
CountyWinnebago County
StateIllinois
Coordinates42.21683, -89.01452
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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating66 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length132 ft (40.2 m)
Longest span88 ft (26.8 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,650 (2022)
Projected traffic4,545 by 2046
Trucks22%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-39 Ramp over Linden Road built?

It was built in 1981, making it 44 years old in 2025.

What condition is I-39 Ramp over Linden Road 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-39 Ramp over Linden Road carry?

About 4,650 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is I-39 Ramp over Linden Road?

The structure is 132 ft (40.2 m) long with a longest span of 88 ft (26.8 m) and a deck 28 ft wide.

Who owns I-39 Ramp over Linden Road?

It is owned by the State Highway Agency.