US Bridges

IH 43-N-S Freeway over Ramp IH 43NBL-STH 57

Fair

Milwaukee County, Wisconsin · X 0.3M N JCT Sth 190 to E · Structure no. B40011600000000

Built
1961
64 years old, rebuilt 1984
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
139 ft
3 main spans
Daily traffic
126,000
2022 count
Owner
State
State Highway Agency

About this bridge

IH 43-N-S Freeway over Ramp IH 43NBL-STH 57 is a steel continuous stringer/multi-beam or girder carrying IH 43-N-S Freeway over Ramp IH 43NBL-STH 57 in Milwaukee County, Wisconsin. It was built in 1961 and reconstructed in 1984, so it is 64 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 126,000 vehicles a day, roughly 1% of them trucks, projected to reach 151,200 by 2039. The structure is 139 ft (42.3 m) long and 103 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIH 43-N-S Freeway
CrossesRamp IH 43NBL-STH 57
LocationX 0.3M N JCT Sth 190 to E
RouteInterstate 43
CountyMilwaukee County
StateWisconsin
Coordinates43.09206, -87.92172
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.
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 geometry7: Better than present minimum 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 spans3
Design loadHS 20
Structure length139 ft (42.3 m)
Longest span59 ft (17.9 m)
Deck width103 ft (31.4 m)
Roadway width96 ft (29.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic126,000 (2022)
Projected traffic151,200 by 2039
Trucks1%
Lanes on structure6
Traffic directionTwo-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$872,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 43-N-S Freeway over Ramp IH 43NBL-STH 57 built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1984.

What condition is IH 43-N-S Freeway over Ramp IH 43NBL-STH 57 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-N-S Freeway over Ramp IH 43NBL-STH 57 carry?

About 126,000 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is IH 43-N-S Freeway over Ramp IH 43NBL-STH 57?

The structure is 139 ft (42.3 m) long with a longest span of 59 ft (17.9 m) and a deck 103 ft wide.

Who owns IH 43-N-S Freeway over Ramp IH 43NBL-STH 57?

It is owned by the State Highway Agency.