US Bridges

M 277 over West Swan

Fair

St. Louis County, Minnesota · 2.6 MI E of County Line · Structure no. 2112

Built
1932
93 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
150
1975 count
Owner
City
City or Municipal Highway Agency

About this bridge

M 277 over West Swan is a concrete culvert carrying M 277 over West Swan in St. Louis County, Minnesota. It was built in 1932, so it is 93 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.

It carries about 150 vehicles a day, projected to reach 150 by 2029. The structure is 23 ft (6.9 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM 277
CrossesWest Swan
Location2.6 MI E of County Line
RouteCity Street 277
CountySt. Louis County
StateMinnesota
Coordinates47.39367, -93.01694
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.4 US tons
Inventory rating21.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length23 ft (6.9 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (1975)
Projected traffic150 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M 277 over West Swan built?

It was built in 1932, making it 93 years old in 2025.

What condition is M 277 over West Swan 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 2023.

How much traffic does M 277 over West Swan carry?

About 150 vehicles per day (1975 count).

How long is M 277 over West Swan?

The structure is 23 ft (6.9 m) long with a longest span of 10 ft (3.2 m).

Who owns M 277 over West Swan?

It is owned by the City or Municipal Highway Agency.