US Bridges

Cth X over Ahnapee River

Fair

Door County, Wisconsin · 0.8M E JCT Cth D · Structure no. B15001100000000

Built
1989
36 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
70 ft
2 main spans
Daily traffic
678
2022 count
Owner
County
County Highway Agency

About this bridge

Cth X over Ahnapee River is a concrete continuous slab carrying Cth X over Ahnapee River in Door County, Wisconsin. It was built in 1989, so it is 36 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 678 vehicles a day, projected to reach 745 by 2043. The structure is 70 ft (21.3 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCth X
CrossesAhnapee River
Location0.8M E JCT Cth D
RouteCounty Highway 0X
CountyDoor County
StateWisconsin
Coordinates44.67553, -87.48397
Functional classRural Major 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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to 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 typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span34 ft (10.4 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic678 (2022)
Projected traffic745 by 2043
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 X over Ahnapee River built?

It was built in 1989, making it 36 years old in 2025.

What condition is Cth X over Ahnapee 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 September 2024.

How much traffic does Cth X over Ahnapee River carry?

About 678 vehicles per day (2022 count).

How long is Cth X over Ahnapee River?

The structure is 70 ft (21.3 m) long with a longest span of 34 ft (10.4 m) and a deck 36 ft wide.

Who owns Cth X over Ahnapee River?

It is owned by the County Highway Agency.