US Bridges

Cth N over IH 39 / IH 90

Good

Dane County, Wisconsin · 2 MI S of JCT With Ush 12 · Structure no. B13072000000000

Built
2017
8 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
239 ft
2 main spans
Daily traffic
10,600
2022 count
Owner
State
State Highway Agency

About this bridge

Cth N over IH 39 / IH 90 is a prestressed concrete continuous stringer/multi-beam or girder carrying Cth N over IH 39 / IH 90 in Dane County, Wisconsin. It was built in 2017, so it is 8 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 10,600 vehicles a day, projected to reach 13,010 by 2040. The structure is 239 ft (72.8 m) long and 85 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesCth N
CrossesIH 39 / IH 90
Location2 MI S of JCT With Ush 12
RouteCounty Highway 0N
CountyDane County
StateWisconsin
Coordinates43.00151, -89.20032
Functional classRural Minor Arterial

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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61.4 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length239 ft (72.8 m)
Longest span117 ft (35.7 m)
Deck width85 ft (25.8 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,600 (2022)
Projected traffic13,010 by 2040
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

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 Cth N over IH 39 / IH 90 built?

It was built in 2017, making it 8 years old in 2025.

What condition is Cth N 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 June 2023.

How much traffic does Cth N over IH 39 / IH 90 carry?

About 10,600 vehicles per day (2022 count).

How long is Cth N over IH 39 / IH 90?

The structure is 239 ft (72.8 m) long with a longest span of 117 ft (35.7 m) and a deck 85 ft wide.

Who owns Cth N over IH 39 / IH 90?

It is owned by the State Highway Agency.