US Bridges

Cth U over Primrose Branch

Fair

Dane County, Wisconsin · 0.6M N JCT Cth a · Structure no. P13010100000000

Built
1978
47 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
527
2022 count
Owner
County
County Highway Agency

About this bridge

Cth U over Primrose Branch is a concrete slab carrying Cth U over Primrose Branch in Dane County, Wisconsin. It was built in 1978, so it is 47 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 5 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 527 vehicles a day, projected to reach 579 by 2043. The structure is 29 ft (8.8 m) long and 33 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesCth U
CrossesPrimrose Branch
Location0.6M N JCT Cth a
RouteCounty Highway 0U
CountyDane County
StateWisconsin
Coordinates42.91089, -89.64719
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.9 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span27 ft (8.1 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic527 (2022)
Projected traffic579 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 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 U over Primrose Branch built?

It was built in 1978, making it 47 years old in 2025.

What condition is Cth U over Primrose Branch 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 2024.

How much traffic does Cth U over Primrose Branch carry?

About 527 vehicles per day (2022 count).

How long is Cth U over Primrose Branch?

The structure is 29 ft (8.8 m) long with a longest span of 27 ft (8.1 m) and a deck 33 ft wide.

Who owns Cth U over Primrose Branch?

It is owned by the County Highway Agency.