US Bridges

I-39 Off Ramp over US 20 Bypass

Fair

Winnebago County, Illinois · SW Edge of Rockford · Structure no. 101013500000000

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

About this bridge

I-39 Off Ramp over US 20 Bypass is a steel continuous stringer/multi-beam or girder carrying I-39 Off Ramp over US 20 Bypass 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 5 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 247 ft (75.3 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-39 Off Ramp
CrossesUS 20 Bypass
LocationSW Edge of Rockford
CountyWinnebago County
StateIllinois
Coordinates42.22028, -89.01107
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating58.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length247 ft (75.3 m)
Longest span99 ft (30.2 m)
Deck width53 ft (16.2 m)
Roadway width50 ft (15.1 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
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 Off Ramp over US 20 Bypass built?

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

What condition is I-39 Off Ramp over US 20 Bypass 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 Off Ramp over US 20 Bypass carry?

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

How long is I-39 Off Ramp over US 20 Bypass?

The structure is 247 ft (75.3 m) long with a longest span of 99 ft (30.2 m) and a deck 53 ft wide.

Who owns I-39 Off Ramp over US 20 Bypass?

It is owned by the State Highway Agency.