US Bridges

I-39 Ramp over Linden RD

Fair

Winnebago County, Illinois · 0.25 MI S of US 20 · Structure no. 101013800000000

Built
1981
44 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
1 main span
Daily traffic
4,550
2022 count
Owner
State
State Highway Agency

About this bridge

I-39 Ramp over Linden RD is a steel stringer/multi-beam or girder carrying I-39 Ramp over Linden RD 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 4,550 vehicles a day, roughly 20% of them trucks, projected to reach 4,747 by 2046. The structure is 150 ft (45.7 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-39 Ramp
CrossesLinden RD
Location0.25 MI S of US 20
CountyWinnebago County
StateIllinois
Coordinates42.21687, -89.01125
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.3 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span86 ft (26.2 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,550 (2022)
Projected traffic4,747 by 2046
Trucks20%
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 RD built?

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

What condition is I-39 Ramp over Linden RD 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 April 2023.

How much traffic does I-39 Ramp over Linden RD carry?

About 4,550 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is I-39 Ramp over Linden RD?

The structure is 150 ft (45.7 m) long with a longest span of 86 ft (26.2 m) and a deck 42 ft wide.

Who owns I-39 Ramp over Linden RD?

It is owned by the State Highway Agency.