US Bridges

US 20 W B over Ill 251 (11th St)

Fair

Winnebago County, Illinois · S Edge Rockford · Structure no. 101006600000000

Built
1960
65 years old, rebuilt 2009
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
234 ft
4 main spans
Daily traffic
36,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 W B over Ill 251 (11th St) is a steel stringer/multi-beam or girder carrying US 20 W B over Ill 251 (11th St) in Winnebago County, Illinois. It was built in 1960 and reconstructed in 2009, so it is 65 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 5 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 36,000 vehicles a day, roughly 15% of them trucks, projected to reach 17,423 by 2046. The structure is 234 ft (71.4 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20 W B
CrossesIll 251 (11th St)
LocationS Edge Rockford
RouteU.S. Route 20
CountyWinnebago County
StateIllinois
Coordinates42.21947, -89.07211
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length234 ft (71.4 m)
Longest span73 ft (22.3 m)
Deck width50 ft (15.3 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,000 (2023)
Projected traffic17,423 by 2046
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 W B over Ill 251 (11th St) built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2009.

What condition is US 20 W B over Ill 251 (11th St) 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 February 2023.

How much traffic does US 20 W B over Ill 251 (11th St) carry?

About 36,000 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 20 W B over Ill 251 (11th St)?

The structure is 234 ft (71.4 m) long with a longest span of 73 ft (22.3 m) and a deck 50 ft wide.

Who owns US 20 W B over Ill 251 (11th St)?

It is owned by the State Highway Agency.