US Bridges

Mn 371B over TH 371

Fair

Crow Wing County, Minnesota · 2.3 MI N of JCT Csah 27 · Structure no. 18006

Built
2002
23 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
278 ft
2 main spans
Daily traffic
4,933
2021 count
Owner
State
State Highway Agency

About this bridge

Mn 371B over TH 371 is a prestressed concrete stringer/multi-beam or girder carrying Mn 371B over TH 371 in Crow Wing County, Minnesota. It was built in 2002, so it is 23 years old, younger 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 4,933 vehicles a day, roughly 7% of them trucks, projected to reach 9,700 by 2041. The structure is 278 ft (84.6 m) long and 114 ft wide. If it were closed, the detour would be 123 mi (198 km).

Location

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CarriesMn 371B
CrossesTH 371
Location2.3 MI N of JCT Csah 27
RouteState Highway 371B
CountyCrow Wing County
StateMinnesota
Coordinates46.29423, -94.27164
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99.6 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length278 ft (84.6 m)
Longest span135 ft (41.3 m)
Deck width114 ft (34.6 m)
Roadway width94 ft (28.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,933 (2021)
Projected traffic9,700 by 2041
Trucks7%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123 mi (198 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mn 371B over TH 371 built?

It was built in 2002, making it 23 years old in 2025.

What condition is Mn 371B over TH 371 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 October 2023.

How much traffic does Mn 371B over TH 371 carry?

About 4,933 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Mn 371B over TH 371?

The structure is 278 ft (84.6 m) long with a longest span of 135 ft (41.3 m) and a deck 114 ft wide.

Who owns Mn 371B over TH 371?

It is owned by the State Highway Agency.