US Bridges

I-39 & US 20 SB over UP RR

Fair

Winnebago County, Illinois · 1.4 MI S of I-90 · Structure no. 101006900000000

Built
1963
62 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
280 ft
3 main spans
Daily traffic
25,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 & US 20 SB over UP RR is a steel continuous stringer/multi-beam or girder carrying I-39 & US 20 SB over UP RR in Winnebago County, Illinois. It was built in 1963, so it is 62 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 25,450 vehicles a day, roughly 28% of them trucks, projected to reach 26,361 by 2046. The structure is 280 ft (85.3 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI-39 & US 20 SB
CrossesUP RR
Location1.4 MI S of I-90
RouteInterstate 39
CountyWinnebago County
StateIllinois
Coordinates42.23151, -88.97396
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.5 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length280 ft (85.3 m)
Longest span106 ft (32.3 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,450 (2023)
Projected traffic26,361 by 2046
Trucks28%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 & US 20 SB over UP RR built?

It was built in 1963, making it 62 years old in 2025.

What condition is I-39 & US 20 SB over UP RR 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 January 2025.

How much traffic does I-39 & US 20 SB over UP RR carry?

About 25,450 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I-39 & US 20 SB over UP RR?

The structure is 280 ft (85.3 m) long with a longest span of 106 ft (32.3 m) and a deck 42 ft wide.

Who owns I-39 & US 20 SB over UP RR?

It is owned by the State Highway Agency.