US Bridges

Sth 11 over Sinsinawa River

Fair

Grant County, Wisconsin · 7.0M E JCT Ush 61 · Structure no. B22061700000000

Built
1939
86 years old, rebuilt 1990
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
2 main spans
Daily traffic
4,300
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 11 over Sinsinawa River is a steel stringer/multi-beam or girder carrying Sth 11 over Sinsinawa River in Grant County, Wisconsin. It was built in 1939 and reconstructed in 1990, so it is 86 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 4,300 vehicles a day, roughly 10% of them trucks, projected to reach 4,790 by 2043. The structure is 104 ft (31.8 m) long and 38 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesSth 11
CrossesSinsinawa River
Location7.0M E JCT Ush 61
RouteState Highway 11
CountyGrant County
StateWisconsin
Coordinates42.5339, -90.48169
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 inspectionOctober 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 rating57.7 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length104 ft (31.8 m)
Longest span50 ft (15.1 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2022)
Projected traffic4,790 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Sth 11 over Sinsinawa River built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1990.

What condition is Sth 11 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 October 2023.

How much traffic does Sth 11 over Sinsinawa River carry?

About 4,300 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Sth 11 over Sinsinawa River?

The structure is 104 ft (31.8 m) long with a longest span of 50 ft (15.1 m) and a deck 38 ft wide.

Who owns Sth 11 over Sinsinawa River?

It is owned by the State Highway Agency.