US Bridges

Lrd 320th ST over Tiffany Creek

Good

St. Croix County, Wisconsin · 0.5M S JCT Sth 170 · Structure no. B55010700000000

Built
1988
37 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete
Length
38 ft
1 main span
Daily traffic
325
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Lrd 320th ST over Tiffany Creek is a concrete slab carrying Lrd 320th ST over Tiffany Creek in St. Croix County, Wisconsin. It was built in 1988, so it is 37 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 325 vehicles a day, projected to reach 334 by 2043. The structure is 38 ft (11.5 m) long and 26 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesLrd 320th ST
CrossesTiffany Creek
Location0.5M S JCT Sth 170
RouteCity Street 0
Coordinates45.04629, -92.15684
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating61.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.5 m)
Longest span36 ft (11 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic325 (2022)
Projected traffic334 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Lrd 320th ST over Tiffany Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is Lrd 320th ST over Tiffany 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 October 2024.

How much traffic does Lrd 320th ST over Tiffany Creek carry?

About 325 vehicles per day (2022 count).

How long is Lrd 320th ST over Tiffany Creek?

The structure is 38 ft (11.5 m) long with a longest span of 36 ft (11 m) and a deck 26 ft wide.

Who owns Lrd 320th ST over Tiffany Creek?

It is owned by the Town or Township Highway Agency.