US Bridges

Cth P over Rock Creek

Fair

Marathon County, Wisconsin · 1.1M E JCT Sth 97 · Structure no. P37030700000000

Built
1932
93 years old, rebuilt 1999
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
34 ft
1 main span
Daily traffic
500
2022 count
Owner
County
County Highway Agency

About this bridge

Cth P over Rock Creek is a concrete slab carrying Cth P over Rock Creek in Marathon County, Wisconsin. It was built in 1932 and reconstructed in 1999, so it is 93 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 6 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 500 vehicles a day, projected to reach 631 by 2042. The structure is 34 ft (10.3 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 P
CrossesRock Creek
Location1.1M E JCT Sth 97
RouteCounty Highway 0P
CountyMarathon County
StateWisconsin
Coordinates44.85867, -90.05745
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length34 ft (10.3 m)
Longest span31 ft (9.5 m)
Deck width29 ft (8.9 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2022)
Projected traffic631 by 2042
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth P over Rock Creek built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1999.

What condition is Cth P over Rock Creek 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 September 2023.

How much traffic does Cth P over Rock Creek carry?

About 500 vehicles per day (2022 count).

How long is Cth P over Rock Creek?

The structure is 34 ft (10.3 m) long with a longest span of 31 ft (9.5 m) and a deck 29 ft wide.

Who owns Cth P over Rock Creek?

It is owned by the County Highway Agency.