US Bridges

Sth 105-UNION ST over ST Louis River

FairPosted for load

Douglas County, Wisconsin · At Minnesota State Line · Structure no. B16075500000000

Built
1910
115 years old, rebuilt 2001
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,905 ft
35 main spans
Daily traffic
2,205
2022 count
Owner
Railroad
Railroad

About this bridge

Sth 105-UNION ST over ST Louis River is a steel stringer/multi-beam or girder carrying Sth 105-UNION ST over ST Louis River in Douglas County, Wisconsin. It was built in 1910 and reconstructed in 2001, so it is 115 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 2,205 vehicles a day, roughly 4% of them trucks, projected to reach 2,425 by 2042. The structure is 1,905 ft (580.6 m) long and 24 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesSth 105-UNION ST
CrossesST Louis River
LocationAt Minnesota State Line
RouteState Highway 105
Coordinates46.65638, -92.20778
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating59.4 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans35
Design loadH 10
Structure length1,905 ft (580.6 m)
Longest span150 ft (45.7 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic2,205 (2022)
Projected traffic2,425 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and railroad
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerRailroad
Maintained byRailroad
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$10.9 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 105-UNION ST over ST Louis River built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 2001.

What condition is Sth 105-UNION ST over ST Louis River 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 2023.

How much traffic does Sth 105-UNION ST over ST Louis River carry?

About 2,205 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Sth 105-UNION ST over ST Louis River?

The structure is 1,905 ft (580.6 m) long with a longest span of 150 ft (45.7 m) and a deck 24 ft wide.

Who owns Sth 105-UNION ST over ST Louis River?

It is owned by the Railroad.