US Bridges

Cth Bb over Tainter Lake

PoorPosted for load

Dunn County, Wisconsin · 1.7M E JCT Sth 25 · Structure no. B17095100000000

Built
1935
90 years old
Condition
Poor
inspected August 2024
Type
Truss - Deck
Steel
Length
431 ft
4 main spans
Daily traffic
2,234
2024 count
Owner
County
County Highway Agency

About this bridge

Cth Bb over Tainter Lake is a steel truss - deck carrying Cth Bb over Tainter Lake in Dunn County, Wisconsin. It was built in 1935, so it is 90 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 3 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. Its operating status is: posted for load restriction.

It carries about 2,234 vehicles a day, projected to reach 2,344 by 2043. The structure is 431 ft (131.4 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesCth Bb
CrossesTainter Lake
Location1.7M E JCT Sth 25
RouteCounty Highway 0BB
Coordinates44.9348, -91.88792
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.4 US tons
Inventory rating17.9 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length431 ft (131.4 m)
Longest span145 ft (44.2 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,234 (2024)
Projected traffic2,344 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$2.2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth Bb over Tainter Lake built?

It was built in 1935, making it 90 years old in 2025.

What condition is Cth Bb over Tainter 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 August 2024.

How much traffic does Cth Bb over Tainter Lake carry?

About 2,234 vehicles per day (2024 count).

How long is Cth Bb over Tainter Lake?

The structure is 431 ft (131.4 m) long with a longest span of 145 ft (44.2 m) and a deck 32 ft wide.

Who owns Cth Bb over Tainter Lake?

It is owned by the County Highway Agency.