US Bridges

Cth M over Yahara River

Fair

Rock County, Wisconsin · 0.1M E JCT Cth H · Structure no. B53000300000000

Built
1950
75 years old, rebuilt 2008
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
161 ft
3 main spans
Daily traffic
1,282
2024 count
Owner
County
County Highway Agency

About this bridge

Cth M over Yahara River is a steel continuous stringer/multi-beam or girder carrying Cth M over Yahara River in Rock County, Wisconsin. It was built in 1950 and reconstructed in 2008, so it is 75 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 5 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 1,282 vehicles a day, roughly 3% of them trucks, projected to reach 1,386 by 2043. The structure is 161 ft (49 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCth M
CrossesYahara River
Location0.1M E JCT Cth H
RouteCounty Highway 0M
CountyRock County
StateWisconsin
Coordinates42.80808, -89.12572
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
Deck9 ExcellentNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length161 ft (49 m)
Longest span60 ft (18.3 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,282 (2024)
Projected traffic1,386 by 2043
Trucks3%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth M over Yahara River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2008.

What condition is Cth M over Yahara River 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 July 2024.

How much traffic does Cth M over Yahara River carry?

About 1,282 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Cth M over Yahara River?

The structure is 161 ft (49 m) long with a longest span of 60 ft (18.3 m) and a deck 29 ft wide.

Who owns Cth M over Yahara River?

It is owned by the County Highway Agency.