US Bridges

Cth O over Rock River

PoorPosted for load

Dodge County, Wisconsin · 1.6M W JCT Sth 67 · Structure no. B14001000000000

Built
1952
73 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
159 ft
3 main spans
Daily traffic
770
2021 count
Owner
County
County Highway Agency

About this bridge

Cth O over Rock River is a steel continuous stringer/multi-beam or girder carrying Cth O over Rock River in Dodge County, Wisconsin. It was built in 1952, so it is 73 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 other load-capacity restriction.

It carries about 770 vehicles a day, projected to reach 924 by 2041. The structure is 159 ft (48.6 m) long and 27 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesCth O
CrossesRock River
Location1.6M W JCT Sth 67
RouteCounty Highway 0O
CountyDodge County
StateWisconsin
Coordinates43.22226, -88.54157
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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 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 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 rating34.2 US tons
Inventory rating19.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length159 ft (48.6 m)
Longest span60 ft (18.3 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic770 (2021)
Projected traffic924 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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$848,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth O over Rock River built?

It was built in 1952, making it 73 years old in 2025.

What condition is Cth O over Rock 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 May 2024.

How much traffic does Cth O over Rock River carry?

About 770 vehicles per day (2021 count).

How long is Cth O over Rock River?

The structure is 159 ft (48.6 m) long with a longest span of 60 ft (18.3 m) and a deck 27 ft wide.

Who owns Cth O over Rock River?

It is owned by the County Highway Agency.