US Bridges

Sth 136 over Baraboo River

Fair

Sauk County, Wisconsin · 1.1M E JCT Sth 23 · Structure no. B56001200000000

Built
1951
74 years old, rebuilt 1987
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
160 ft
3 main spans
Daily traffic
850
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 136 over Baraboo River is a steel continuous stringer/multi-beam or girder carrying Sth 136 over Baraboo River in Sauk County, Wisconsin. It was built in 1951 and reconstructed in 1987, so it is 74 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 850 vehicles a day, roughly 4% of them trucks, projected to reach 1,020 by 2041. The structure is 160 ft (48.9 m) long and 30 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

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CarriesSth 136
CrossesBaraboo River
Location1.1M E JCT Sth 23
RouteState Highway 136
CountySauk County
StateWisconsin
Coordinates43.51711, -89.94942
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.7 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length160 ft (48.9 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 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 1951, making it 74 years old in 2025. It was reconstructed in 1987.

What condition is Sth 136 over Baraboo River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 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 160 ft (48.9 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns Sth 136 over Baraboo River?

It is owned by the State Highway Agency.