US Bridges

I-39 & US 20 over Madigan Creek

Fair

Winnebago County, Illinois · 1 MI S of I-90 · Structure no. 101202500000000

Built
1963
62 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
50,900
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 & US 20 over Madigan Creek is a concrete culvert carrying I-39 & US 20 over Madigan Creek 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 50,900 vehicles a day, roughly 28% of them trucks, projected to reach 52,722 by 2046. The structure is 29 ft (8.9 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesI-39 & US 20
CrossesMadigan Creek
Location1 MI S of I-90
RouteInterstate 39
CountyWinnebago County
StateIllinois
Coordinates42.23572, -88.96929
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length29 ft (8.9 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,900 (2023)
Projected traffic52,722 by 2046
Trucks28%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-39 & US 20 over Madigan Creek built?

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

What condition is I-39 & US 20 over Madigan Creek 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 February 2024.

How much traffic does I-39 & US 20 over Madigan Creek carry?

About 50,900 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I-39 & US 20 over Madigan Creek?

The structure is 29 ft (8.9 m) long with a longest span of 14 ft (4.3 m).

Who owns I-39 & US 20 over Madigan Creek?

It is owned by the State Highway Agency.