US Bridges

US 20 EB over Sumner Creek

Fair

Stephenson County, Illinois · 1.2MI W Winnebago CO · Structure no. 089001400000000

Built
1959
66 years old, rebuilt 1994
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
12,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 EB over Sumner Creek is a concrete continuous slab carrying US 20 EB over Sumner Creek in Stephenson County, Illinois. It was built in 1959 and reconstructed in 1994, so it is 66 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 12,700 vehicles a day, roughly 16% of them trucks, projected to reach 7,020 by 2046. The structure is 103 ft (31.4 m) long and 43 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesUS 20 EB
CrossesSumner Creek
Location1.2MI W Winnebago CO
RouteU.S. Route 20
CountyStephenson County
StateIllinois
Coordinates42.27856, -89.42033
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length103 ft (31.4 m)
Longest span38 ft (11.5 m)
Deck width43 ft (13.2 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 directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 EB over Sumner Creek built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1994.

What condition is US 20 EB over Sumner 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 September 2024.

How much traffic does US 20 EB over Sumner Creek carry?

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

How long is US 20 EB over Sumner Creek?

The structure is 103 ft (31.4 m) long with a longest span of 38 ft (11.5 m) and a deck 43 ft wide.

Who owns US 20 EB over Sumner Creek?

It is owned by the State Highway Agency.