US Bridges

IH 39 NB / IH 90 W over Cth Mn

Good

Dane County, Wisconsin · 2.0M W JCT Cth N to E · Structure no. B13072300000000

Built
2018
7 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
117 ft
1 main span
Daily traffic
29,600
2022 count
Owner
State
State Highway Agency

About this bridge

IH 39 NB / IH 90 W over Cth Mn is a prestressed concrete stringer/multi-beam or girder carrying IH 39 NB / IH 90 W over Cth Mn in Dane County, Wisconsin. It was built in 2018, so it is 7 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 29,600 vehicles a day, roughly 29% of them trucks, projected to reach 35,520 by 2042. The structure is 117 ft (35.7 m) long and 63 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
CrossesCth Mn
Location2.0M W JCT Cth N to E
RouteInterstate 39
CountyDane County
StateWisconsin
Coordinates43.01285, -89.23274
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 48 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 rating53.2 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length117 ft (35.7 m)
Longest span110 ft (33.5 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,600 (2022)
Projected traffic35,520 by 2042
Trucks29%
Lanes on structure3
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 Cth Mn built?

It was built in 2018, making it 7 years old in 2025.

What condition is IH 39 NB / IH 90 W over Cth Mn 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 November 2024.

How much traffic does IH 39 NB / IH 90 W over Cth Mn carry?

About 29,600 vehicles per day (2022 count), of which roughly 29% are trucks.

How long is IH 39 NB / IH 90 W over Cth Mn?

The structure is 117 ft (35.7 m) long with a longest span of 110 ft (33.5 m) and a deck 63 ft wide.

Who owns IH 39 NB / IH 90 W over Cth Mn?

It is owned by the State Highway Agency.