US Bridges

US 20 E B over Simpson RD

Fair

Winnebago County, Illinois · 0.8 MI W of Ill 2 · Structure no. 101005300000000

Built
1964
61 years old, rebuilt 2008
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
174 ft
3 main spans
Daily traffic
20,400
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 E B over Simpson RD is a steel continuous stringer/multi-beam or girder carrying US 20 E B over Simpson RD in Winnebago County, Illinois. It was built in 1964 and reconstructed in 2008, so it is 61 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 20,400 vehicles a day, roughly 13% of them trucks, projected to reach 10,555 by 2046. The structure is 174 ft (52.9 m) long and 42 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesUS 20 E B
CrossesSimpson RD
Location0.8 MI W of Ill 2
RouteU.S. Route 20
CountyWinnebago County
StateIllinois
Coordinates42.22319, -89.1241
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.5 US tons
Inventory rating52.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length174 ft (52.9 m)
Longest span60 ft (18.3 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,400 (2023)
Projected traffic10,555 by 2046
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 E B over Simpson RD built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2008.

What condition is US 20 E B over Simpson RD 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 E B over Simpson RD carry?

About 20,400 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is US 20 E B over Simpson RD?

The structure is 174 ft (52.9 m) long with a longest span of 60 ft (18.3 m) and a deck 42 ft wide.

Who owns US 20 E B over Simpson RD?

It is owned by the State Highway Agency.