US Bridges

Sth 59 over IH 39

Good

Rock County, Wisconsin · 2.2 M E JCT Ush 51 · Structure no. B53035900000000

Built
2016
9 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
209 ft
2 main spans
Daily traffic
11,700
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 59 over IH 39 is a prestressed concrete stringer/multi-beam or girder carrying Sth 59 over IH 39 in Rock County, Wisconsin. It was built in 2016, so it is 9 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 11,700 vehicles a day, projected to reach 14,040 by 2043. The structure is 209 ft (63.7 m) long and 73 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSth 59
CrossesIH 39
Location2.2 M E JCT Ush 51
RouteState Highway 59
Coordinates42.83583, -89.02861
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 inspectionAugust 2024
Inspection intervalevery 48 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 rating65 US tons
Inventory rating40.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length209 ft (63.7 m)
Longest span102 ft (31.1 m)
Deck width73 ft (22.3 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,700 (2022)
Projected traffic14,040 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 Sth 59 over IH 39 built?

It was built in 2016, making it 9 years old in 2025.

What condition is Sth 59 over IH 39 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 August 2024.

How much traffic does Sth 59 over IH 39 carry?

About 11,700 vehicles per day (2022 count).

How long is Sth 59 over IH 39?

The structure is 209 ft (63.7 m) long with a longest span of 102 ft (31.1 m) and a deck 73 ft wide.

Who owns Sth 59 over IH 39?

It is owned by the State Highway Agency.