US Bridges

US 20 WB over Menominee River

Fair

Jo Daviess County, Illinois · 3.8 MI E JCT Ill 35 · Structure no. 043000300000000

Built
1964
61 years old, rebuilt 2012
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
129 ft
3 main spans
Daily traffic
9,450
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 WB over Menominee River is a steel continuous stringer/multi-beam or girder carrying US 20 WB over Menominee River in Jo Daviess County, Illinois. It was built in 1964 and reconstructed in 2012, 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 9,450 vehicles a day, roughly 21% of them trucks, projected to reach 5,505 by 2046. The structure is 129 ft (39.4 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesUS 20 WB
CrossesMenominee River
Location3.8 MI E JCT Ill 35
RouteU.S. Route 20
Coordinates42.46509, -90.58407
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating68.2 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length129 ft (39.4 m)
Longest span46 ft (14.1 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,450 (2023)
Projected traffic5,505 by 2046
Trucks21%
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$477,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 WB over Menominee River built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2012.

What condition is US 20 WB over Menominee 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 Menominee River carry?

About 9,450 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US 20 WB over Menominee River?

The structure is 129 ft (39.4 m) long with a longest span of 46 ft (14.1 m) and a deck 37 ft wide.

Who owns US 20 WB over Menominee River?

It is owned by the State Highway Agency.