US Bridges

Cth H over Rocky Run

PoorPosted for load

Marathon County, Wisconsin · 1.4M N JCT Sth 153 · Structure no. B37008500000000

Built
1960
65 years old
Condition
Poor
inspected September 2024
Type
Slab
Concrete Continuous
Length
55 ft
2 main spans
Daily traffic
668
2024 count
Owner
County
County Highway Agency

About this bridge

Cth H over Rocky Run is a concrete continuous slab carrying Cth H over Rocky Run in Marathon County, Wisconsin. It was built in 1960, so it is 65 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 668 vehicles a day, projected to reach 721 by 2043. The structure is 55 ft (16.9 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesCth H
CrossesRocky Run
Location1.4M N JCT Sth 153
RouteCounty Highway 0H
Coordinates44.8215, -89.96401
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
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 inspectionSeptember 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 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 rating36.4 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length55 ft (16.9 m)
Longest span27 ft (8.2 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic668 (2024)
Projected traffic721 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$304,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth H over Rocky Run built?

It was built in 1960, making it 65 years old in 2025.

What condition is Cth H over Rocky Run 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 September 2024.

How much traffic does Cth H over Rocky Run carry?

About 668 vehicles per day (2024 count).

How long is Cth H over Rocky Run?

The structure is 55 ft (16.9 m) long with a longest span of 27 ft (8.2 m) and a deck 29 ft wide.

Who owns Cth H over Rocky Run?

It is owned by the County Highway Agency.