US Bridges

Cth N (17th Ave.) over Big Rib River

Fair

Marathon County, Wisconsin · 0.6M N JCT Cth Nn · Structure no. B37033500000000

Built
2004
21 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
1,579 ft
12 main spans
Daily traffic
14,600
2024 count
Owner
County
County Highway Agency

About this bridge

Cth N (17th Ave.) over Big Rib River is a prestressed concrete continuous stringer/multi-beam or girder carrying Cth N (17th Ave.) over Big Rib River in Marathon County, Wisconsin. It was built in 2004, so it is 21 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 14,600 vehicles a day, roughly 5% of them trucks, projected to reach 18,216 by 2043. The structure is 1,579 ft (481.4 m) long and 70 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesCth N (17th Ave.)
CrossesBig Rib River
Location0.6M N JCT Cth Nn
RouteCounty Highway 0N
CountyMarathon County
StateWisconsin
Coordinates44.93982, -89.65504
Functional classUrban Other Principal 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating110.1 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length1,579 ft (481.4 m)
Longest span131 ft (40 m)
Deck width70 ft (21.3 m)
Roadway width58 ft (17.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,600 (2024)
Projected traffic18,216 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemYes

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 N (17th Ave.) over Big Rib River built?

It was built in 2004, making it 21 years old in 2025.

What condition is Cth N (17th Ave.) over Big Rib 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 August 2024.

How much traffic does Cth N (17th Ave.) over Big Rib River carry?

About 14,600 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Cth N (17th Ave.) over Big Rib River?

The structure is 1,579 ft (481.4 m) long with a longest span of 131 ft (40 m) and a deck 70 ft wide.

Who owns Cth N (17th Ave.) over Big Rib River?

It is owned by the County Highway Agency.