US Bridges

Cth B over Clam River

Fair

Burnett County, Wisconsin · 5.3M E JCT Sth 35 · Structure no. B07000700000000

Built
1981
44 years old
Condition
Fair
inspected October 2024
Type
Slab
Wood or Timber
Length
82 ft
3 main spans
Daily traffic
250
2024 count
Owner
County
County Highway Agency

About this bridge

Cth B over Clam River is a wood or timber slab carrying Cth B over Clam River in Burnett County, Wisconsin. It was built in 1981, so it is 44 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 250 vehicles a day, projected to reach 262 by 2043. The structure is 82 ft (25 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCth B
CrossesClam River
Location5.3M E JCT Sth 35
RouteCounty Highway 0B
CountyBurnett County
StateWisconsin
Coordinates45.75714, -92.30406
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 rating66.6 US tons
Inventory rating46.4 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length82 ft (25 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2024)
Projected traffic262 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Clam River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Cth B over Clam 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 October 2024.

How much traffic does Cth B over Clam River carry?

About 250 vehicles per day (2024 count).

How long is Cth B over Clam River?

The structure is 82 ft (25 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Cth B over Clam River?

It is owned by the County Highway Agency.