US Bridges

US 20 WB over Sinsinawa River

Fair

Jo Daviess County, Illinois · 2 Mi. W. of Il 84 · Structure no. 043004700000000

Built
1993
32 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
290 ft
2 main spans
Daily traffic
8,650
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 WB over Sinsinawa River is a steel continuous stringer/multi-beam or girder carrying US 20 WB over Sinsinawa River in Jo Daviess County, Illinois. It was built in 1993, so it is 32 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 8,650 vehicles a day, roughly 12% of them trucks, projected to reach 4,747 by 2046. The structure is 290 ft (88.4 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20 WB
CrossesSinsinawa River
Location2 Mi. W. of Il 84
RouteU.S. Route 20
CountyJo Daviess County
StateIllinois
Coordinates42.45683, -90.4935
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.2 US tons
Inventory rating56.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length290 ft (88.4 m)
Longest span145 ft (44.2 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,650 (2023)
Projected traffic4,747 by 2046
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 WB over Sinsinawa River built?

It was built in 1993, making it 32 years old in 2025.

What condition is US 20 WB over Sinsinawa River 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 2023.

How much traffic does US 20 WB over Sinsinawa River carry?

About 8,650 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 20 WB over Sinsinawa River?

The structure is 290 ft (88.4 m) long with a longest span of 145 ft (44.2 m) and a deck 41 ft wide.

Who owns US 20 WB over Sinsinawa River?

It is owned by the State Highway Agency.