US Bridges

IH 43 NB over Cth U

Fair

Waukesha County, Wisconsin · 1.2M N JCT Sth 164 · Structure no. B67011600000000

Built
1969
56 years old, rebuilt 2021
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
201 ft
3 main spans
Daily traffic
20,400
2022 count
Owner
State
State Highway Agency

About this bridge

IH 43 NB over Cth U is a steel continuous stringer/multi-beam or girder carrying IH 43 NB over Cth U in Waukesha County, Wisconsin. It was built in 1969 and reconstructed in 2021, so it is 56 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 20,400 vehicles a day, roughly 1% of them trucks, projected to reach 24,480 by 2042. The structure is 201 ft (61.3 m) long and 56 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIH 43 NB
CrossesCth U
Location1.2M N JCT Sth 164
RouteInterstate 43
CountyWaukesha County
StateWisconsin
Coordinates42.91854, -88.1993
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length201 ft (61.3 m)
Longest span111 ft (33.8 m)
Deck width56 ft (17.2 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,400 (2022)
Projected traffic24,480 by 2042
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
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 U built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2021.

What condition is IH 43 NB over Cth U 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 July 2023.

How much traffic does IH 43 NB over Cth U carry?

About 20,400 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is IH 43 NB over Cth U?

The structure is 201 ft (61.3 m) long with a longest span of 111 ft (33.8 m) and a deck 56 ft wide.

Who owns IH 43 NB over Cth U?

It is owned by the State Highway Agency.