US Bridges

Sth 78 over Syftestad Creek

Good

Dane County, Wisconsin · 1.1M N JCT Cth H · Structure no. B13047500000000

Built
1999
26 years old
Condition
Good
inspected September 2021
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
174
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 78 over Syftestad Creek is a concrete slab carrying Sth 78 over Syftestad Creek in Dane County, Wisconsin. It was built in 1999, so it is 26 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 174 vehicles a day, roughly 47% of them trucks, projected to reach 280 by 2040. The structure is 27 ft (8.3 m) long and 37 ft wide. If it were closed, the detour would be 40.4 mi (65 km).

CarriesSth 78
CrossesSyftestad Creek
Location1.1M N JCT Cth H
RouteState Highway 78
Coordinates42.88537, -89.80909
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.3 m)
Longest span25 ft (7.5 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic174 (2022)
Projected traffic280 by 2040
Trucks47%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed40.4 mi (65 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 78 over Syftestad Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Sth 78 over Syftestad Creek 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 September 2021.

How much traffic does Sth 78 over Syftestad Creek carry?

About 174 vehicles per day (2022 count), of which roughly 47% are trucks.

How long is Sth 78 over Syftestad Creek?

The structure is 27 ft (8.3 m) long with a longest span of 25 ft (7.5 m) and a deck 37 ft wide.

Who owns Sth 78 over Syftestad Creek?

It is owned by the State Highway Agency.