US Bridges

Cth K over Black River

Fair

Jackson County, Wisconsin · 0.6M S JCT Cth E · Structure no. B27006800000000

Built
1972
53 years old
Condition
Fair
inspected August 2023
Type
Frame
Steel Continuous
Length
295 ft
3 main spans
Daily traffic
1,100
2022 count
Owner
County
County Highway Agency

About this bridge

Cth K over Black River is a steel continuous frame carrying Cth K over Black River in Jackson County, Wisconsin. It was built in 1972, so it is 53 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 1,100 vehicles a day, projected to reach 886 by 2042. The structure is 295 ft (89.8 m) long and 38 ft wide. If it were closed, the detour would be 15.5 mi (25 km).

Location

Open in Google Maps
CarriesCth K
CrossesBlack River
Location0.6M S JCT Cth E
RouteCounty Highway 0K
CountyJackson County
StateWisconsin
Coordinates44.40703, -90.72928
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.2 US tons
Inventory rating62.5 US tons

Structure

Structure typeFrame
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length295 ft (89.8 m)
Longest span120 ft (36.6 m)
Deck width38 ft (11.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2022)
Projected traffic886 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed15.5 mi (25 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 K over Black River built?

It was built in 1972, making it 53 years old in 2025.

What condition is Cth K over Black 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 August 2023.

How much traffic does Cth K over Black River carry?

About 1,100 vehicles per day (2022 count).

How long is Cth K over Black River?

The structure is 295 ft (89.8 m) long with a longest span of 120 ft (36.6 m) and a deck 38 ft wide.

Who owns Cth K over Black River?

It is owned by the County Highway Agency.