US Bridges

Cth N over Eau Claire River

Fair

Marathon County, Wisconsin · 0.5M W JCT Cth Q to S · Structure no. B37002600000000

Built
1957
68 years old, rebuilt 2003
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
195 ft
3 main spans
Daily traffic
1,825
2023 count
Owner
County
County Highway Agency

About this bridge

Cth N over Eau Claire River is a prestressed concrete stringer/multi-beam or girder carrying Cth N over Eau Claire River in Marathon County, Wisconsin. It was built in 1957 and reconstructed in 2003, so it is 68 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 1,825 vehicles a day, projected to reach 1,804 by 2042. The structure is 195 ft (59.4 m) long and 32 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

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CarriesCth N
CrossesEau Claire River
Location0.5M W JCT Cth Q to S
RouteCounty Highway 0N
CountyMarathon County
StateWisconsin
Coordinates44.94391, -89.41953
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.
Superstructure8 Very GoodNo problems noted.
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 inspectionSeptember 2023
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 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 rating64.8 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length195 ft (59.4 m)
Longest span74 ft (22.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,825 (2023)
Projected traffic1,804 by 2042
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 N over Eau Claire River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2003.

What condition is Cth N over Eau Claire 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 September 2023.

How much traffic does Cth N over Eau Claire River carry?

About 1,825 vehicles per day (2023 count).

How long is Cth N over Eau Claire River?

The structure is 195 ft (59.4 m) long with a longest span of 74 ft (22.6 m) and a deck 32 ft wide.

Who owns Cth N over Eau Claire River?

It is owned by the County Highway Agency.