US Bridges

Ush 12-MAIN ST over Koshkonong Creek

Good

Dane County, Wisconsin · 0.4M E JCT Sth 134 · Structure no. B13044900000000

Built
1998
27 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
70 ft
2 main spans
Daily traffic
8,000
2022 count
Owner
State
State Highway Agency

About this bridge

Ush 12-MAIN ST over Koshkonong Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Ush 12-MAIN ST over Koshkonong Creek in Dane County, Wisconsin. It was built in 1998, so it is 27 years old, younger than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,000 vehicles a day, roughly 8% of them trucks, projected to reach 9,600 by 2042. The structure is 70 ft (21.2 m) long and 56 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesUsh 12-MAIN ST
CrossesKoshkonong Creek
Location0.4M E JCT Sth 134
RouteU.S. Route 12
CountyDane County
StateWisconsin
Coordinates43.00431, -89.02079
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.2 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length70 ft (21.2 m)
Longest span33 ft (10 m)
Deck width56 ft (17.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2022)
Projected traffic9,600 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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 Ush 12-MAIN ST over Koshkonong Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is Ush 12-MAIN ST over Koshkonong Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does Ush 12-MAIN ST over Koshkonong Creek carry?

About 8,000 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Ush 12-MAIN ST over Koshkonong Creek?

The structure is 70 ft (21.2 m) long with a longest span of 33 ft (10 m) and a deck 56 ft wide.

Who owns Ush 12-MAIN ST over Koshkonong Creek?

It is owned by the State Highway Agency.