US Bridges

I-39 & US 20 N B over Cn RR

Fair

Winnebago County, Illinois · 4.7 MI E of Il 251 · Structure no. 101006700000000

Built
1963
62 years old, rebuilt 1990
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
170 ft
3 main spans
Daily traffic
25,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 & US 20 N B over Cn RR is a steel continuous stringer/multi-beam or girder carrying I-39 & US 20 N B over Cn RR in Winnebago County, Illinois. It was built in 1963 and reconstructed in 1990, 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 170 ft (51.7 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 & US 20 N B
CrossesCn RR
Location4.7 MI E of Il 251
RouteInterstate 39
CountyWinnebago County
StateIllinois
Coordinates42.22322, -88.98392
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 geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating89 US tons
Inventory rating53.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length170 ft (51.7 m)
Longest span61 ft (18.6 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 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 closed1.2 mi (2 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 N B over Cn RR built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1990.

What condition is I-39 & US 20 N B over Cn 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 N B over Cn RR carry?

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

How long is I-39 & US 20 N B over Cn RR?

The structure is 170 ft (51.7 m) long with a longest span of 61 ft (18.6 m) and a deck 42 ft wide.

Who owns I-39 & US 20 N B over Cn RR?

It is owned by the State Highway Agency.