US Bridges

Jefferson ST over Kent Creek

Good

Winnebago County, Illinois · 0.1 MI W. of Kilburn · Structure no. 101611500000000

Built
1940
85 years old, rebuilt 1995
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
4,150
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Jefferson ST over Kent Creek is a prestressed concrete box beam or girders - multiple carrying Jefferson ST over Kent Creek in Winnebago County, Illinois. It was built in 1940 and reconstructed in 1995, so it is 85 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,150 vehicles a day, roughly 3% of them trucks, projected to reach 4,495 by 2046. The structure is 67 ft (20.4 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesJefferson ST
CrossesKent Creek
Location0.1 MI W. of Kilburn
RouteU.S. Route 20
Coordinates42.27632, -89.10107
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating38.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span64 ft (19.4 m)
Deck width58 ft (17.7 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,150 (2023)
Projected traffic4,495 by 2046
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Jefferson ST over Kent Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1995.

What condition is Jefferson ST over Kent Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Jefferson ST over Kent Creek carry?

About 4,150 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Jefferson ST over Kent Creek?

The structure is 67 ft (20.4 m) long with a longest span of 64 ft (19.4 m) and a deck 58 ft wide.

Who owns Jefferson ST over Kent Creek?

It is owned by the City or Municipal Highway Agency.