US Bridges

Sth 136 over Baraboo River

Good

Sauk County, Wisconsin · 3.5M E JCT Sth 23 · Structure no. B56005800000000

Built
1978
47 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
142 ft
3 main spans
Daily traffic
850
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 136 over Baraboo River is a prestressed concrete continuous stringer/multi-beam or girder carrying Sth 136 over Baraboo River in Sauk County, Wisconsin. It was built in 1978, so it is 47 years old, older 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 850 vehicles a day, roughly 4% of them trucks, projected to reach 1,020 by 2041. The structure is 142 ft (43.4 m) long and 38 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesSth 136
CrossesBaraboo River
Location3.5M E JCT Sth 23
RouteState Highway 136
Coordinates43.49186, -89.92827
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.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.2 US tons
Inventory rating25 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length142 ft (43.4 m)
Longest span47 ft (14.4 m)
Deck width38 ft (11.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2021)
Projected traffic1,020 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 136 over Baraboo River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Sth 136 over Baraboo River 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 July 2024.

How much traffic does Sth 136 over Baraboo River carry?

About 850 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Sth 136 over Baraboo River?

The structure is 142 ft (43.4 m) long with a longest span of 47 ft (14.4 m) and a deck 38 ft wide.

Who owns Sth 136 over Baraboo River?

It is owned by the State Highway Agency.