US Bridges

IH 43 NB over Sth 23

Fair

Sheboygan County, Wisconsin · 2.8M N JCT Sth 28 to E · Structure no. B59007700000000

Built
1977
48 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
206 ft
2 main spans
Daily traffic
15,700
2021 count
Owner
State
State Highway Agency

About this bridge

IH 43 NB over Sth 23 is a prestressed concrete continuous stringer/multi-beam or girder carrying IH 43 NB over Sth 23 in Sheboygan County, Wisconsin. It was built in 1977, so it is 48 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 15,700 vehicles a day, roughly 20% of them trucks, projected to reach 26,650 by 2042. The structure is 206 ft (62.7 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesIH 43 NB
CrossesSth 23
Location2.8M N JCT Sth 28 to E
RouteInterstate 43
CountySheboygan County
StateWisconsin
Coordinates43.75408, -87.76407
Functional classUrban Principal Arterial - Interstate

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.2 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length206 ft (62.7 m)
Longest span103 ft (31.5 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,700 (2021)
Projected traffic26,650 by 2042
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 43 NB over Sth 23 built?

It was built in 1977, making it 48 years old in 2025.

What condition is IH 43 NB over Sth 23 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 November 2023.

How much traffic does IH 43 NB over Sth 23 carry?

About 15,700 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is IH 43 NB over Sth 23?

The structure is 206 ft (62.7 m) long with a longest span of 103 ft (31.5 m) and a deck 44 ft wide.

Who owns IH 43 NB over Sth 23?

It is owned by the State Highway Agency.