US Bridges

IH 43 NB over Cth Aa

Fair

Sheboygan County, Wisconsin · 4.1M N JCT Sth 32 to N · Structure no. B59004300000000

Built
1970
55 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
159 ft
2 main spans
Daily traffic
14,100
2021 count
Owner
State
State Highway Agency

About this bridge

IH 43 NB over Cth Aa is a prestressed concrete continuous stringer/multi-beam or girder carrying IH 43 NB over Cth Aa in Sheboygan County, Wisconsin. It was built in 1970, so it is 55 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 14,100 vehicles a day, roughly 15% of them trucks, projected to reach 20,679 by 2042. The structure is 159 ft (48.4 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesIH 43 NB
CrossesCth Aa
Location4.1M N JCT Sth 32 to N
RouteInterstate 43
CountySheboygan County
StateWisconsin
Coordinates43.62282, -87.76979
Functional classRural 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.
Superstructure7 GoodSome minor problems.
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 rating48.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length159 ft (48.4 m)
Longest span80 ft (24.4 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,100 (2021)
Projected traffic20,679 by 2042
Trucks15%
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 Cth Aa built?

It was built in 1970, making it 55 years old in 2025.

What condition is IH 43 NB over Cth Aa 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 Cth Aa carry?

About 14,100 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is IH 43 NB over Cth Aa?

The structure is 159 ft (48.4 m) long with a longest span of 80 ft (24.4 m) and a deck 43 ft wide.

Who owns IH 43 NB over Cth Aa?

It is owned by the State Highway Agency.