US Bridges

Cth D over Namekagon River

Good

Bayfield County, Wisconsin · 0.7M N JCT Cth M · Structure no. B04001600000000

Built
1964
61 years old, rebuilt 2010
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
80 ft
3 main spans
Daily traffic
558
2023 count
Owner
County
County Highway Agency

About this bridge

Cth D over Namekagon River is a steel continuous stringer/multi-beam or girder carrying Cth D over Namekagon River in Bayfield County, Wisconsin. It was built in 1964 and reconstructed in 2010, so it is 61 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 558 vehicles a day, projected to reach 610 by 2042. The structure is 80 ft (24.4 m) long and 32 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

Open in Google Maps
CarriesCth D
CrossesNamekagon River
Location0.7M N JCT Cth M
RouteCounty Highway 0D
CountyBayfield County
StateWisconsin
Coordinates46.20444, -91.07361
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
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 rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic558 (2023)
Projected traffic610 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed12.4 mi (20 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 D over Namekagon River built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2010.

What condition is Cth D over Namekagon River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Cth D over Namekagon River carry?

About 558 vehicles per day (2023 count).

How long is Cth D over Namekagon River?

The structure is 80 ft (24.4 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Cth D over Namekagon River?

It is owned by the County Highway Agency.