US Bridges

M 330 over W Swan River

FairPosted for load

St. Louis County, Minnesota · 0.9 MI S of JCT CR606 · Structure no. L6057

Built
1921
104 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
52
1969 count
Owner
City
City or Municipal Highway Agency

About this bridge

M 330 over W Swan River is a concrete slab carrying M 330 over W Swan River in St. Louis County, Minnesota. It was built in 1921, so it is 104 years old, older than the Minnesota average of 38.5 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 52 vehicles a day, projected to reach 52 by 2029. The structure is 23 ft (6.9 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM 330
CrossesW Swan River
Location0.9 MI S of JCT CR606
RouteCity Street 330
CountySt. Louis County
StateMinnesota
Coordinates47.29198, -93.04518
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating9 US tons
Inventory rating3.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (6.9 m)
Longest span20 ft (6.1 m)
Deck width22 ft (6.6 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52 (1969)
Projected traffic52 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$51 million
NavigationNo navigation control on waterway

Frequently asked questions

When was M 330 over W Swan River built?

It was built in 1921, making it 104 years old in 2025.

What condition is M 330 over W Swan 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 2024.

How much traffic does M 330 over W Swan River carry?

About 52 vehicles per day (1969 count).

How long is M 330 over W Swan River?

The structure is 23 ft (6.9 m) long with a longest span of 20 ft (6.1 m) and a deck 22 ft wide.

Who owns M 330 over W Swan River?

It is owned by the City or Municipal Highway Agency.