US Bridges

Cth-R over Willow Harbor Creek

Good

Winnebago County, Wisconsin · 0.01 M N JCT Cth-Z · Structure no. B70009000000000

Built
1978
47 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete Continuous
Length
45 ft
3 main spans
Daily traffic
1,400
2021 count
Owner
County
County Highway Agency

About this bridge

Cth-R over Willow Harbor Creek is a concrete continuous culvert carrying Cth-R over Willow Harbor Creek in Winnebago County, Wisconsin. It was built in 1978, so it is 47 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,400 vehicles a day, roughly 5% of them trucks, projected to reach 1,680 by 2041. The structure is 45 ft (13.6 m) long. If it were closed, the detour would be 24.9 mi (40 km).

CarriesCth-R
CrossesWillow Harbor Creek
Location0.01 M N JCT Cth-Z
RouteCounty Highway 0R
Coordinates43.90764, -88.50363
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length45 ft (13.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2021)
Projected traffic1,680 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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-R over Willow Harbor Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Cth-R over Willow Harbor Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Cth-R over Willow Harbor Creek carry?

About 1,400 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Cth-R over Willow Harbor Creek?

The structure is 45 ft (13.6 m) long with a longest span of 12 ft (3.7 m).

Who owns Cth-R over Willow Harbor Creek?

It is owned by the County Highway Agency.