US Bridges

IH 43 NB / Sth 81 over IH 39 / IH 90

Good

Rock County, Wisconsin · 3.4M E JCT Ush 51 to N · Structure no. B53030300000000

Built
2021
4 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
273 ft
2 main spans
Daily traffic
18,800
2022 count
Owner
State
State Highway Agency

About this bridge

IH 43 NB / Sth 81 over IH 39 / IH 90 is a prestressed concrete continuous stringer/multi-beam or girder carrying IH 43 NB / Sth 81 over IH 39 / IH 90 in Rock County, Wisconsin. It was built in 2021, so it is 4 years old, younger than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 18,800 vehicles a day, roughly 10% of them trucks, projected to reach 24,900 by 2040. The structure is 273 ft (83.2 m) long and 63 ft wide.

Location

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CarriesIH 43 NB / Sth 81
CrossesIH 39 / IH 90
Location3.4M E JCT Ush 51 to N
RouteInterstate 43
CountyRock County
StateWisconsin
Coordinates42.52833, -88.97528
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length273 ft (83.2 m)
Longest span134 ft (40.8 m)
Deck width63 ft (19.2 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,800 (2022)
Projected traffic24,900 by 2040
Trucks10%
Lanes on structure3
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 / Sth 81 over IH 39 / IH 90 built?

It was built in 2021, making it 4 years old in 2025.

What condition is IH 43 NB / Sth 81 over IH 39 / IH 90 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does IH 43 NB / Sth 81 over IH 39 / IH 90 carry?

About 18,800 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is IH 43 NB / Sth 81 over IH 39 / IH 90?

The structure is 273 ft (83.2 m) long with a longest span of 134 ft (40.8 m) and a deck 63 ft wide.

Who owns IH 43 NB / Sth 81 over IH 39 / IH 90?

It is owned by the State Highway Agency.