US Bridges

Cth B / Adams ST over Koshkonong Creek

Good

Dane County, Wisconsin · 2.3M E JCT Sth 73 · Structure no. B13061200000000

Built
2009
16 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
101 ft
1 main span
Daily traffic
1,104
2022 count
Owner
County
County Highway Agency

About this bridge

Cth B / Adams ST over Koshkonong Creek is a prestressed concrete stringer/multi-beam or girder carrying Cth B / Adams ST over Koshkonong Creek in Dane County, Wisconsin. It was built in 2009, so it is 16 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 1,104 vehicles a day, projected to reach 1,214 by 2043. The structure is 101 ft (30.8 m) long and 46 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCth B / Adams ST
CrossesKoshkonong Creek
Location2.3M E JCT Sth 73
RouteCounty Highway 0B
CountyDane County
StateWisconsin
Coordinates42.97236, -89.03183
Functional classRural Major Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74.3 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length101 ft (30.8 m)
Longest span97 ft (29.6 m)
Deck width46 ft (14 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,104 (2022)
Projected traffic1,214 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Cth B / Adams ST over Koshkonong Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is Cth B / Adams 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 October 2024.

How much traffic does Cth B / Adams ST over Koshkonong Creek carry?

About 1,104 vehicles per day (2022 count).

How long is Cth B / Adams ST over Koshkonong Creek?

The structure is 101 ft (30.8 m) long with a longest span of 97 ft (29.6 m) and a deck 46 ft wide.

Who owns Cth B / Adams ST over Koshkonong Creek?

It is owned by the County Highway Agency.