US Bridges

Sth 35-2nd ST over Lake Mallalieu

Fair

St. Croix County, Wisconsin · 1.9M N JCT IH 94 to W · Structure no. B55007300000000

Built
1978
47 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
379 ft
3 main spans
Daily traffic
12,500
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 35-2nd ST over Lake Mallalieu is a prestressed concrete continuous stringer/multi-beam or girder carrying Sth 35-2nd ST over Lake Mallalieu in St. Croix County, Wisconsin. It was built in 1978, so it is 47 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 12,500 vehicles a day, roughly 7% of them trucks, projected to reach 14,300 by 2041. The structure is 379 ft (115.4 m) long and 63 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesSth 35-2nd ST
CrossesLake Mallalieu
Location1.9M N JCT IH 94 to W
RouteState Highway 35
CountySt. Croix County
StateWisconsin
Coordinates44.98861, -92.75704
Functional classUrban Other Principal 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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length379 ft (115.4 m)
Longest span125 ft (38.2 m)
Deck width63 ft (19.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,500 (2021)
Projected traffic14,300 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed39.8 mi (64 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 35-2nd ST over Lake Mallalieu built?

It was built in 1978, making it 47 years old in 2025.

What condition is Sth 35-2nd ST over Lake Mallalieu 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 35-2nd ST over Lake Mallalieu carry?

About 12,500 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Sth 35-2nd ST over Lake Mallalieu?

The structure is 379 ft (115.4 m) long with a longest span of 125 ft (38.2 m) and a deck 63 ft wide.

Who owns Sth 35-2nd ST over Lake Mallalieu?

It is owned by the State Highway Agency.