US Bridges

IH 43 NB over Sth 50

Fair

Walworth County, Wisconsin · 6.4 MI N JCT Ush 14 · Structure no. B64011800000000

Built
1975
50 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
241 ft
2 main spans
Daily traffic
10,950
2022 count
Owner
State
State Highway Agency

About this bridge

IH 43 NB over Sth 50 is a steel continuous stringer/multi-beam or girder carrying IH 43 NB over Sth 50 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 10,950 vehicles a day, roughly 16% of them trucks, projected to reach 13,140 by 2042. The structure is 241 ft (73.5 m) long and 44 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIH 43 NB
CrossesSth 50
Location6.4 MI N JCT Ush 14
RouteInterstate 43
CountyWalworth County
StateWisconsin
Coordinates42.62743, -88.61868
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length241 ft (73.5 m)
Longest span120 ft (36.6 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,950 (2022)
Projected traffic13,140 by 2042
Trucks16%
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 Sth 50 built?

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

What condition is IH 43 NB over Sth 50 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 August 2023.

How much traffic does IH 43 NB over Sth 50 carry?

About 10,950 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is IH 43 NB over Sth 50?

The structure is 241 ft (73.5 m) long with a longest span of 120 ft (36.6 m) and a deck 44 ft wide.

Who owns IH 43 NB over Sth 50?

It is owned by the State Highway Agency.