US Bridges

Sth 23 over Wisconsin River 06

Fair

Iowa County, Wisconsin · 0.1M E JCT Cth C to E · Structure no. B25005100000000

Built
1965
60 years old, rebuilt 2021
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
964 ft
7 main spans
Daily traffic
3,000
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 23 over Wisconsin River 06 is a steel continuous stringer/multi-beam or girder carrying Sth 23 over Wisconsin River 06 in Iowa County, Wisconsin. It was built in 1965 and reconstructed in 2021, so it is 60 years old, older than the Wisconsin average of 40.3 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 3,000 vehicles a day, roughly 7% of them trucks, projected to reach 3,600 by 2042. The structure is 964 ft (293.9 m) long and 35 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

Open in Google Maps
CarriesSth 23
CrossesWisconsin River 06
Location0.1M E JCT Cth C to E
RouteState Highway 23
CountyIowa County
StateWisconsin
Coordinates43.14376, -90.06158
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length964 ft (293.9 m)
Longest span145 ft (44.2 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2022)
Projected traffic3,600 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 km)
TollOn a free road
National Highway SystemNo

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 Sth 23 over Wisconsin River 06 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2021.

What condition is Sth 23 over Wisconsin River 06 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 Sth 23 over Wisconsin River 06 carry?

About 3,000 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is Sth 23 over Wisconsin River 06?

The structure is 964 ft (293.9 m) long with a longest span of 145 ft (44.2 m) and a deck 35 ft wide.

Who owns Sth 23 over Wisconsin River 06?

It is owned by the State Highway Agency.