US Bridges

I-39 & US 51 NB over Kilbuck Creek

Fair

Ogle County, Illinois · 3 MI N of Ill 64 · Structure no. 071005300000000

Built
1981
44 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
457 ft
7 main spans
Daily traffic
16,100
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 & US 51 NB over Kilbuck Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying I-39 & US 51 NB over Kilbuck Creek in Ogle 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 16,100 vehicles a day, roughly 32% of them trucks, projected to reach 14,716 by 2046. The structure is 457 ft (139.3 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 51 NB
CrossesKilbuck Creek
Location3 MI N of Ill 64
RouteInterstate 39
CountyOgle County
StateIllinois
Coordinates42.04925, -89.01986
Functional classRural 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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.5 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length457 ft (139.3 m)
Longest span71 ft (21.6 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,100 (2023)
Projected traffic14,716 by 2046
Trucks32%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-39 & US 51 NB over Kilbuck Creek built?

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

What condition is I-39 & US 51 NB over Kilbuck 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 May 2023.

How much traffic does I-39 & US 51 NB over Kilbuck Creek carry?

About 16,100 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is I-39 & US 51 NB over Kilbuck Creek?

The structure is 457 ft (139.3 m) long with a longest span of 71 ft (21.6 m) and a deck 42 ft wide.

Who owns I-39 & US 51 NB over Kilbuck Creek?

It is owned by the State Highway Agency.