US Bridges

Sth 13-STH 77 over Soo Line

Good

Ashland County, Wisconsin · 6.2M N JCT Sth 77 to W · Structure no. B02002500000000

Built
1985
40 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
210 ft
2 main spans
Daily traffic
1,200
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 13-STH 77 over Soo Line is a prestressed concrete continuous stringer/multi-beam or girder carrying Sth 13-STH 77 over Soo Line in Ashland County, Wisconsin. It was built in 1985, so it is 40 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 1,200 vehicles a day, roughly 12% of them trucks, projected to reach 1,600 by 2040. The structure is 210 ft (64.1 m) long and 39 ft wide. If it were closed, the detour would be 55.9 mi (90 km).

Location

Open in Google Maps
CarriesSth 13-STH 77
CrossesSoo Line
Location6.2M N JCT Sth 77 to W
RouteState Highway 13
CountyAshland County
StateWisconsin
Coordinates46.23398, -90.67017
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length210 ft (64.1 m)
Longest span104 ft (31.7 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2022)
Projected traffic1,600 by 2040
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed55.9 mi (90 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 13-STH 77 over Soo Line built?

It was built in 1985, making it 40 years old in 2025.

What condition is Sth 13-STH 77 over Soo Line 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 October 2023.

How much traffic does Sth 13-STH 77 over Soo Line carry?

About 1,200 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is Sth 13-STH 77 over Soo Line?

The structure is 210 ft (64.1 m) long with a longest span of 104 ft (31.7 m) and a deck 39 ft wide.

Who owns Sth 13-STH 77 over Soo Line?

It is owned by the State Highway Agency.