US Bridges

IH 43 NB over Cth H

Fair

Walworth County, Wisconsin · 1.3 MI N JCT Sth 67 · Structure no. B64010600000000

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
237 ft
2 main spans
Daily traffic
11,850
2022 count
Owner
State
State Highway Agency

About this bridge

IH 43 NB over Cth H is a steel continuous stringer/multi-beam or girder carrying IH 43 NB over Cth H in Walworth County, Wisconsin. It was built in 1975, so it is 50 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 11,850 vehicles a day, roughly 12% of them trucks, projected to reach 14,220 by 2042. The structure is 237 ft (72.1 m) long and 47 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIH 43 NB
CrossesCth H
Location1.3 MI N JCT Sth 67
RouteInterstate 43
CountyWalworth County
StateWisconsin
Coordinates42.66985, -88.52624
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length237 ft (72.1 m)
Longest span118 ft (36 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,850 (2022)
Projected traffic14,220 by 2042
Trucks12%
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 H built?

It was built in 1975, making it 50 years old in 2025.

What condition is IH 43 NB over Cth H 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 March 2023.

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

About 11,850 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is IH 43 NB over Cth H?

The structure is 237 ft (72.1 m) long with a longest span of 118 ft (36 m) and a deck 47 ft wide.

Who owns IH 43 NB over Cth H?

It is owned by the State Highway Agency.