US Bridges

Cth I over IH 39 NB

Good

Dane County, Wisconsin · 0.5M N JCT Cth V · Structure no. B13063900000000

Built
2013
12 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
275 ft
2 main spans
Daily traffic
2,000
2022 count
Owner
State
State Highway Agency

About this bridge

Cth I over IH 39 NB is a prestressed concrete continuous stringer/multi-beam or girder carrying Cth I over IH 39 NB in Dane County, Wisconsin. It was built in 2013, so it is 12 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 2,000 vehicles a day, roughly 5% of them trucks, projected to reach 2,400 by 2042. The structure is 275 ft (83.8 m) long and 43 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesCth I
CrossesIH 39 NB
Location0.5M N JCT Cth V
RouteCounty Highway 0I
CountyDane County
StateWisconsin
Coordinates43.2576, -89.38302
Functional classRural Major Collector

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 inspectionSeptember 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 alignment6: Equal to present minimum criteria
Operating rating52.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length275 ft (83.8 m)
Longest span135 ft (41.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2022)
Projected traffic2,400 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed7.5 mi (12 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 I over IH 39 NB built?

It was built in 2013, making it 12 years old in 2025.

What condition is Cth I over IH 39 NB 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 September 2023.

How much traffic does Cth I over IH 39 NB carry?

About 2,000 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Cth I over IH 39 NB?

The structure is 275 ft (83.8 m) long with a longest span of 135 ft (41.1 m) and a deck 43 ft wide.

Who owns Cth I over IH 39 NB?

It is owned by the State Highway Agency.