US Bridges

Cth O over Ashippun River

Fair

Dodge County, Wisconsin · 3.4M N JCT Cth P · Structure no. P14090200000000

Built
1973
52 years old, rebuilt 1987
Condition
Fair
inspected May 2024
Type
Channel Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
2,100
2022 count
Owner
County
County Highway Agency

About this bridge

Cth O over Ashippun River is a prestressed concrete channel beam carrying Cth O over Ashippun River in Dodge County, Wisconsin. It was built in 1973 and reconstructed in 1987, so it is 52 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 2,100 vehicles a day, projected to reach 2,520 by 2043. The structure is 31 ft (9.4 m) long and 34 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesCth O
CrossesAshippun River
Location3.4M N JCT Cth P
RouteCounty Highway 0O
CountyDodge County
StateWisconsin
Coordinates43.24596, -88.4286
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating50.4 US tons
Inventory rating30.3 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2022)
Projected traffic2,520 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 O over Ashippun River built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1987.

What condition is Cth O over Ashippun 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 May 2024.

How much traffic does Cth O over Ashippun River carry?

About 2,100 vehicles per day (2022 count).

How long is Cth O over Ashippun River?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 34 ft wide.

Who owns Cth O over Ashippun River?

It is owned by the County Highway Agency.