US Bridges

US 20 WB over Wickham Creek

Fair

Stephenson County, Illinois · 4.0 MI W Winn CO LN · Structure no. 089005400000000

Built
1983
42 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
12,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 WB over Wickham Creek is a concrete slab carrying US 20 WB over Wickham Creek in Stephenson County, Illinois. It was built in 1983, so it is 42 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 12,700 vehicles a day, roughly 16% of them trucks, projected to reach 7,020 by 2046. The structure is 32 ft (9.8 m) long and 43 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

CarriesUS 20 WB
CrossesWickham Creek
Location4.0 MI W Winn CO LN
RouteU.S. Route 20
Coordinates42.27503, -89.46814
Functional classRural Principal Arterial - Other

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,700 (2023)
Projected traffic7,020 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 km)
TollOn a free road
National Highway SystemYes

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 US 20 WB over Wickham Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is US 20 WB over Wickham 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 November 2024.

How much traffic does US 20 WB over Wickham Creek carry?

About 12,700 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is US 20 WB over Wickham Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 43 ft wide.

Who owns US 20 WB over Wickham Creek?

It is owned by the State Highway Agency.