US Bridges

US 20 EB over Sinsinawa River

Fair

Jo Daviess County, Illinois · 2.0 MI W JCT ILL84 · Structure no. 043000700000000

Built
1966
59 years old, rebuilt 2012
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
212 ft
3 main spans
Daily traffic
8,650
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 EB over Sinsinawa River is a steel continuous stringer/multi-beam or girder carrying US 20 EB over Sinsinawa River in Jo Daviess County, Illinois. It was built in 1966 and reconstructed in 2012, so it is 59 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 8,650 vehicles a day, roughly 12% of them trucks, projected to reach 4,747 by 2046. The structure is 212 ft (64.5 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 20 EB
CrossesSinsinawa River
Location2.0 MI W JCT ILL84
RouteU.S. Route 20
CountyJo Daviess County
StateIllinois
Coordinates42.45692, -90.49389
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 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 rating107.1 US tons
Inventory rating70.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length212 ft (64.5 m)
Longest span76 ft (23.1 m)
Deck width38 ft (11.6 m)
Roadway width35 ft (10.7 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 closed3.1 mi (5 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$738,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 EB over Sinsinawa River built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2012.

What condition is US 20 EB 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 EB over Sinsinawa River carry?

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

How long is US 20 EB over Sinsinawa River?

The structure is 212 ft (64.5 m) long with a longest span of 76 ft (23.1 m) and a deck 38 ft wide.

Who owns US 20 EB over Sinsinawa River?

It is owned by the State Highway Agency.