US Bridges

School ST over Kent Creek

Fair

Winnebago County, Illinois · 0.2 MI W of Kilburn · Structure no. 101611700000000

Built
1969
56 years old, rebuilt 2003
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
6,200
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

School ST over Kent Creek is a prestressed concrete box beam or girders - multiple carrying School ST over Kent Creek in Winnebago County, Illinois. It was built in 1969 and reconstructed in 2003, so it is 56 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 6,200 vehicles a day, roughly 4% of them trucks, projected to reach 7,171 by 2046. The structure is 51 ft (15.5 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSchool ST
CrossesKent Creek
Location0.2 MI W of Kilburn
Coordinates42.28117, -89.10322
Functional classUrban Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.2 US tons
Inventory rating47.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span49 ft (14.8 m)
Deck width59 ft (18.1 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,200 (2022)
Projected traffic7,171 by 2046
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$404,000
NavigationNo navigation control on waterway

Frequently asked questions

When was School ST over Kent Creek built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2003.

What condition is School ST over Kent 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 August 2023.

How much traffic does School ST over Kent Creek carry?

About 6,200 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is School ST over Kent Creek?

The structure is 51 ft (15.5 m) long with a longest span of 49 ft (14.8 m) and a deck 59 ft wide.

Who owns School ST over Kent Creek?

It is owned by the City or Municipal Highway Agency.