US Bridges

Sth 42 - Sth 57 over Sturgeon Bay

Fair

Door County, Wisconsin · 1.9M N JCT Cth S · Structure no. B15000400030000

Built
1978
47 years old
Condition
Fair
inspected April 2024
Type
Movable - Bascule
Steel
Length
228 ft
1 main span
Daily traffic
14,200
2023 count
Owner
State
State Highway Agency

About this bridge

Sth 42 - Sth 57 over Sturgeon Bay is a steel movable - bascule carrying Sth 42 - Sth 57 over Sturgeon Bay in Door 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 fair condition with a lowest component rating of 5 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 14,200 vehicles a day, roughly 3% of them trucks, projected to reach 12,222 by 2043. The structure is 228 ft (69.6 m) long and 46 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesSth 42 - Sth 57
CrossesSturgeon Bay
Location1.9M N JCT Cth S
RouteState Highway 42
CountyDoor County
StateWisconsin
Coordinates44.82109, -87.35532
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating30.3 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans1
Design loadHS 20
Structure length228 ft (69.6 m)
Longest span228 ft (69.6 m)
Deck width46 ft (14 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,200 (2023)
Projected traffic12,222 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Sth 42 - Sth 57 over Sturgeon Bay built?

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

What condition is Sth 42 - Sth 57 over Sturgeon Bay 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 April 2024.

How much traffic does Sth 42 - Sth 57 over Sturgeon Bay carry?

About 14,200 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Sth 42 - Sth 57 over Sturgeon Bay?

The structure is 228 ft (69.6 m) long with a longest span of 228 ft (69.6 m) and a deck 46 ft wide.

Who owns Sth 42 - Sth 57 over Sturgeon Bay?

It is owned by the State Highway Agency.