US Bridges

Cth B over Rock River

Fair

Jefferson County, Wisconsin · 0.7M E JCT Cth N · Structure no. B28005800000000

Built
1968
57 years old, rebuilt 2005
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
215 ft
3 main spans
Daily traffic
4,100
2022 count
Owner
County
County Highway Agency

About this bridge

Cth B over Rock River is a prestressed concrete continuous stringer/multi-beam or girder carrying Cth B over Rock River in Jefferson County, Wisconsin. It was built in 1968 and reconstructed in 2005, so it is 57 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 4,100 vehicles a day, projected to reach 4,920 by 2042. The structure is 215 ft (65.5 m) long and 36 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesCth B
CrossesRock River
Location0.7M E JCT Cth N
RouteCounty Highway 0B
CountyJefferson County
StateWisconsin
Coordinates43.07167, -88.79464
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating59.4 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length215 ft (65.5 m)
Longest span71 ft (21.6 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2022)
Projected traffic4,920 by 2042
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 B over Rock River built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2005.

What condition is Cth B over Rock 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 July 2024.

How much traffic does Cth B over Rock River carry?

About 4,100 vehicles per day (2022 count).

How long is Cth B over Rock River?

The structure is 215 ft (65.5 m) long with a longest span of 71 ft (21.6 m) and a deck 36 ft wide.

Who owns Cth B over Rock River?

It is owned by the County Highway Agency.