US Bridges

Cth N over Big Sandy Creek

FairPosted for load

Marathon County, Wisconsin · 0.5M W JCT Cth Ss · Structure no. B37004500000000

Built
1959
66 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
4,000
2023 count
Owner
County
County Highway Agency

About this bridge

Cth N over Big Sandy Creek is a concrete continuous slab carrying Cth N over Big Sandy Creek in Marathon County, Wisconsin. It was built in 1959, so it is 66 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. Its operating status is: posted for other load-capacity restriction.

It carries about 4,000 vehicles a day, projected to reach 4,284 by 2042. The structure is 78 ft (23.8 m) long and 28 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesCth N
CrossesBig Sandy Creek
Location0.5M W JCT Cth Ss
RouteCounty Highway 0N
CountyMarathon County
StateWisconsin
Coordinates44.94533, -89.52103
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.2 US tons
Inventory rating19.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length78 ft (23.8 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2023)
Projected traffic4,284 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$528,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth N over Big Sandy Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Cth N over Big Sandy Creek 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 Big Sandy Creek carry?

About 4,000 vehicles per day (2023 count).

How long is Cth N over Big Sandy Creek?

The structure is 78 ft (23.8 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns Cth N over Big Sandy Creek?

It is owned by the County Highway Agency.