US Bridges

Sth 128 over Cnw RR

Fair

St. Croix County, Wisconsin · 0.1M N JCT Ush 12 · Structure no. B55000800000000

Built
1955
70 years old, rebuilt 2011
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
153 ft
3 main spans
Daily traffic
2,500
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 128 over Cnw RR is a steel continuous stringer/multi-beam or girder carrying Sth 128 over Cnw RR in St. Croix County, Wisconsin. It was built in 1955 and reconstructed in 2011, so it is 70 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 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 2,500 vehicles a day, roughly 8% of them trucks, projected to reach 3,000 by 2042. The structure is 153 ft (46.7 m) long and 32 ft wide. If it were closed, the detour would be 25.5 mi (41 km).

Location

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CarriesSth 128
CrossesCnw RR
Location0.1M N JCT Ush 12
RouteState Highway 128
CountySt. Croix County
StateWisconsin
Coordinates44.95658, -92.1963
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length153 ft (46.7 m)
Longest span57 ft (17.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2022)
Projected traffic3,000 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed25.5 mi (41 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sth 128 over Cnw RR built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2011.

What condition is Sth 128 over Cnw 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 September 2024.

How much traffic does Sth 128 over Cnw RR carry?

About 2,500 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Sth 128 over Cnw RR?

The structure is 153 ft (46.7 m) long with a longest span of 57 ft (17.4 m) and a deck 32 ft wide.

Who owns Sth 128 over Cnw RR?

It is owned by the State Highway Agency.