US Bridges

IH 39 NB / IH 90 W over Sth 81

Good

Rock County, Wisconsin · IH-39/90 & IH 43 Intercha · Structure no. B53030600000000

Built
2021
4 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
942 ft
5 main spans
Daily traffic
5,650
2022 count
Owner
State
State Highway Agency

About this bridge

IH 39 NB / IH 90 W over Sth 81 is a steel continuous stringer/multi-beam or girder carrying IH 39 NB / IH 90 W over Sth 81 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 5,650 vehicles a day, roughly 10% of them trucks, projected to reach 6,450 by 2040. The structure is 942 ft (287.2 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIH 39 NB / IH 90 W
CrossesSth 81
LocationIH-39/90 & IH 43 Intercha
RouteInterstate 39
CountyRock County
StateWisconsin
Coordinates42.52913, -88.97137
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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length942 ft (287.2 m)
Longest span232 ft (70.7 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,650 (2022)
Projected traffic6,450 by 2040
Trucks10%
Lanes on structure1
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 39 NB / IH 90 W over Sth 81 built?

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

What condition is IH 39 NB / IH 90 W over Sth 81 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 December 2023.

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

About 5,650 vehicles per day (2022 count), of which roughly 10% are trucks.

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

The structure is 942 ft (287.2 m) long with a longest span of 232 ft (70.7 m) and a deck 36 ft wide.

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

It is owned by the State Highway Agency.