US Bridges

Cth Nn over Ush 51 NB-STH29

Fair

Marathon County, Wisconsin · 0.3 MI N. Cth N · Structure no. B37034300000000

Built
2006
19 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
251 ft
2 main spans
Daily traffic
6,500
2022 count
Owner
State
State Highway Agency

About this bridge

Cth Nn over Ush 51 NB-STH29 is a prestressed concrete continuous stringer/multi-beam or girder carrying Cth Nn over Ush 51 NB-STH29 in Marathon County, Wisconsin. It was built in 2006, so it is 19 years old, younger 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 6,500 vehicles a day, projected to reach 23,000 by 2043. The structure is 251 ft (76.4 m) long and 93 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCth Nn
CrossesUsh 51 NB-STH29
Location0.3 MI N. Cth N
RouteCounty Highway 0NN
CountyMarathon County
StateWisconsin
Coordinates44.933, -89.665
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating102.6 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length251 ft (76.4 m)
Longest span123 ft (37.5 m)
Deck width93 ft (28.2 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2022)
Projected traffic23,000 by 2043
Trucks0%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cth Nn over Ush 51 NB-STH29 built?

It was built in 2006, making it 19 years old in 2025.

What condition is Cth Nn over Ush 51 NB-STH29 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 June 2024.

How much traffic does Cth Nn over Ush 51 NB-STH29 carry?

About 6,500 vehicles per day (2022 count).

How long is Cth Nn over Ush 51 NB-STH29?

The structure is 251 ft (76.4 m) long with a longest span of 123 ft (37.5 m) and a deck 93 ft wide.

Who owns Cth Nn over Ush 51 NB-STH29?

It is owned by the State Highway Agency.