US Bridges

IH 39 SB / IH 90 E over Cth M

Good

Rock County, Wisconsin · 3.5M E JCT Sth 59 to E · Structure no. B53035300000000

Built
2019
6 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
119 ft
1 main span
Daily traffic
29,625
2022 count
Owner
State
State Highway Agency

About this bridge

IH 39 SB / IH 90 E over Cth M is a prestressed concrete stringer/multi-beam or girder carrying IH 39 SB / IH 90 E over Cth M in Rock County, Wisconsin. It was built in 2019, so it is 6 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 29,625 vehicles a day, projected to reach 35,550 by 2040. The structure is 119 ft (36.4 m) long and 63 ft wide.

Location

Open in Google Maps
CarriesIH 39 SB / IH 90 E
CrossesCth M
Location3.5M E JCT Sth 59 to E
RouteInterstate 39
CountyRock County
StateWisconsin
Coordinates42.7892, -89.0044
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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length119 ft (36.4 m)
Longest span115 ft (35.1 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,625 (2022)
Projected traffic35,550 by 2040
Trucks0%
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 39 SB / IH 90 E over Cth M built?

It was built in 2019, making it 6 years old in 2025.

What condition is IH 39 SB / IH 90 E over Cth M 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 39 SB / IH 90 E over Cth M carry?

About 29,625 vehicles per day (2022 count).

How long is IH 39 SB / IH 90 E over Cth M?

The structure is 119 ft (36.4 m) long with a longest span of 115 ft (35.1 m) and a deck 63 ft wide.

Who owns IH 39 SB / IH 90 E over Cth M?

It is owned by the State Highway Agency.