US Bridges

Sth 23 over Br Baraboo River

Fair

Sauk County, Wisconsin · 0.8M E JCT Cth S · Structure no. B56046700000000

Built
1938
87 years old, rebuilt 1991
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
3 main spans
Daily traffic
3,400
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 23 over Br Baraboo River is a steel stringer/multi-beam or girder carrying Sth 23 over Br Baraboo River in Sauk County, Wisconsin. It was built in 1938 and reconstructed in 1991, so it is 87 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 3,400 vehicles a day, roughly 6% of them trucks, projected to reach 4,080 by 2042. The structure is 85 ft (25.8 m) long and 36 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesSth 23
CrossesBr Baraboo River
Location0.8M E JCT Cth S
RouteState Highway 23
CountySauk County
StateWisconsin
Coordinates43.51245, -90.01861
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection9 ExcellentNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length85 ft (25.8 m)
Longest span28 ft (8.6 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (2022)
Projected traffic4,080 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 23 over Br Baraboo River built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1991.

What condition is Sth 23 over Br 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 2023.

How much traffic does Sth 23 over Br Baraboo River carry?

About 3,400 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Sth 23 over Br Baraboo River?

The structure is 85 ft (25.8 m) long with a longest span of 28 ft (8.6 m) and a deck 36 ft wide.

Who owns Sth 23 over Br Baraboo River?

It is owned by the State Highway Agency.