US Bridges

Cth Oo over Onion River

PoorPosted for load

Sheboygan County, Wisconsin · 0.3M E JCT Sth 32 · Structure no. P59006900000000

Built
1931
94 years old
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
146 ft
3 main spans
Daily traffic
300
2024 count
Owner
County
County Highway Agency

About this bridge

Cth Oo over Onion River is a concrete stringer/multi-beam or girder carrying Cth Oo over Onion River in Sheboygan County, Wisconsin. It was built in 1931, so it is 94 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. Its operating status is: posted for load restriction.

It carries about 300 vehicles a day, projected to reach 297 by 2043. The structure is 146 ft (44.5 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCth Oo
CrossesOnion River
Location0.3M E JCT Sth 32
RouteCounty Highway 0OO
Coordinates43.65204, -87.82197
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating30.6 US tons
Inventory rating17.9 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length146 ft (44.5 m)
Longest span47 ft (14.3 m)
Deck width27 ft (8.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2024)
Projected traffic297 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$608,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth Oo over Onion River built?

It was built in 1931, making it 94 years old in 2025.

What condition is Cth Oo over Onion River 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 April 2024.

How much traffic does Cth Oo over Onion River carry?

About 300 vehicles per day (2024 count).

How long is Cth Oo over Onion River?

The structure is 146 ft (44.5 m) long with a longest span of 47 ft (14.3 m) and a deck 27 ft wide.

Who owns Cth Oo over Onion River?

It is owned by the County Highway Agency.