US Bridges

Cth Y over Thomas Slough

Fair

Oconto County, Wisconsin · 6.2M N JCT Cth S · Structure no. B42001700000000

Built
1967
58 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
59 ft
1 main span
Daily traffic
1,055
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Y over Thomas Slough is a prestressed concrete stringer/multi-beam or girder carrying Cth Y over Thomas Slough in Oconto County, Wisconsin. It was built in 1967, so it is 58 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 1,055 vehicles a day, projected to reach 1,160 by 2043. The structure is 59 ft (18.1 m) long and 35 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesCth Y
CrossesThomas Slough
Location6.2M N JCT Cth S
RouteCounty Highway 0Y
CountyOconto County
StateWisconsin
Coordinates44.953, -87.82064
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating52.2 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length59 ft (18.1 m)
Longest span57 ft (17.4 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,055 (2022)
Projected traffic1,160 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Y over Thomas Slough built?

It was built in 1967, making it 58 years old in 2025.

What condition is Cth Y over Thomas Slough 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 Y over Thomas Slough carry?

About 1,055 vehicles per day (2022 count).

How long is Cth Y over Thomas Slough?

The structure is 59 ft (18.1 m) long with a longest span of 57 ft (17.4 m) and a deck 35 ft wide.

Who owns Cth Y over Thomas Slough?

It is owned by the County Highway Agency.