US Bridges

USH12-STH29 over Union Pacific RR

Fair

Dunn County, Wisconsin · 1.0M E JCT IH 94 · Structure no. B17016300000000

Built
2001
24 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
174 ft
3 main spans
Daily traffic
13,700
2023 count
Owner
State
State Highway Agency

About this bridge

USH12-STH29 over Union Pacific RR is a concrete slab carrying USH12-STH29 over Union Pacific RR in Dunn County, Wisconsin. It was built in 2001, so it is 24 years old, younger 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 6 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 13,700 vehicles a day, roughly 8% of them trucks, projected to reach 7,320 by 2043. The structure is 174 ft (53 m) long and 42 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUSH12-STH29
CrossesUnion Pacific RR
Location1.0M E JCT IH 94
RouteU.S. Route 12
CountyDunn County
StateWisconsin
Coordinates44.8865, -91.72386
Functional classRural Principal Arterial - Other

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.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length174 ft (53 m)
Longest span67 ft (20.4 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,700 (2023)
Projected traffic7,320 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was USH12-STH29 over Union Pacific RR built?

It was built in 2001, making it 24 years old in 2025.

What condition is USH12-STH29 over Union Pacific RR 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 August 2024.

How much traffic does USH12-STH29 over Union Pacific RR carry?

About 13,700 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is USH12-STH29 over Union Pacific RR?

The structure is 174 ft (53 m) long with a longest span of 67 ft (20.4 m) and a deck 42 ft wide.

Who owns USH12-STH29 over Union Pacific RR?

It is owned by the State Highway Agency.