US Bridges

Cth W over Thunder Lake

Poor

Oneida County, Wisconsin · 1.1M W JCT Sth 17 · Structure no. B43002200000000

Built
1977
48 years old
Condition
Poor
inspected July 2024
Type
Slab
Concrete
Length
45 ft
1 main span
Daily traffic
322
2024 count
Owner
County
County Highway Agency

About this bridge

Cth W over Thunder Lake is a concrete slab carrying Cth W over Thunder Lake in Oneida County, Wisconsin. It was built in 1977, so it is 48 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 322 vehicles a day, projected to reach 341 by 2043. The structure is 45 ft (13.6 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCth W
CrossesThunder Lake
Location1.1M W JCT Sth 17
RouteCounty Highway 0W
CountyOneida County
StateWisconsin
Coordinates45.66918, -89.39117
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.7 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.6 m)
Longest span43 ft (13.1 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic322 (2024)
Projected traffic341 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$257,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth W over Thunder Lake built?

It was built in 1977, making it 48 years old in 2025.

What condition is Cth W over Thunder Lake in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does Cth W over Thunder Lake carry?

About 322 vehicles per day (2024 count).

How long is Cth W over Thunder Lake?

The structure is 45 ft (13.6 m) long with a longest span of 43 ft (13.1 m) and a deck 36 ft wide.

Who owns Cth W over Thunder Lake?

It is owned by the County Highway Agency.