US Bridges

Sth 42-4th ST over Ahnapee River

Fair

Kewaunee County, Wisconsin · 0.5M N JCT Sth 54 · Structure no. B31003000000000

Built
1984
41 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
169 ft
3 main spans
Daily traffic
4,331
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sth 42-4th ST over Ahnapee River is a concrete continuous slab carrying Sth 42-4th ST over Ahnapee River in Kewaunee County, Wisconsin. It was built in 1984, so it is 41 years old, older 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 4,331 vehicles a day, roughly 9% of them trucks, projected to reach 4,764 by 2043. The structure is 169 ft (51.5 m) long and 57 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSth 42-4th ST
CrossesAhnapee River
Location0.5M N JCT Sth 54
RouteState Highway 42
CountyKewaunee County
StateWisconsin
Coordinates44.61158, -87.43853
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.5 US tons
Inventory rating41.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length169 ft (51.5 m)
Longest span66 ft (20.1 m)
Deck width57 ft (17.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,331 (2022)
Projected traffic4,764 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Sth 42-4th ST over Ahnapee River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Sth 42-4th ST 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 June 2024.

How much traffic does Sth 42-4th ST over Ahnapee River carry?

About 4,331 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Sth 42-4th ST over Ahnapee River?

The structure is 169 ft (51.5 m) long with a longest span of 66 ft (20.1 m) and a deck 57 ft wide.

Who owns Sth 42-4th ST over Ahnapee River?

It is owned by the City or Municipal Highway Agency.