US Bridges

Sth 70 over ST Croix River 08

Fair

Burnett County, Wisconsin · At Minnesota State Line · Structure no. B07002000000000

Built
1991
34 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
605 ft
6 main spans
Daily traffic
4,100
2023 count
Owner
State
State Highway Agency

About this bridge

Sth 70 over ST Croix River 08 is a steel continuous stringer/multi-beam or girder carrying Sth 70 over ST Croix River 08 in Burnett County, Wisconsin. It was built in 1991, so it is 34 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 4,100 vehicles a day, roughly 12% of them trucks, projected to reach 4,800 by 2043. The structure is 605 ft (184.5 m) long and 48 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesSth 70
CrossesST Croix River 08
LocationAt Minnesota State Line
RouteState Highway 70
CountyBurnett County
StateWisconsin
Coordinates45.77332, -92.78199
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 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 rating88.2 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length605 ft (184.5 m)
Longest span107 ft (32.6 m)
Deck width48 ft (14.5 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2023)
Projected traffic4,800 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 70 over ST Croix River 08 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Sth 70 over ST Croix River 08 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 70 over ST Croix River 08 carry?

About 4,100 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Sth 70 over ST Croix River 08?

The structure is 605 ft (184.5 m) long with a longest span of 107 ft (32.6 m) and a deck 48 ft wide.

Who owns Sth 70 over ST Croix River 08?

It is owned by the State Highway Agency.