US Bridges

Mn 6 over Mississippi River

Fair

Itasca County, Minnesota · 6.5 MI SW of JCT TH 2 · Structure no. 31030

Built
1983
42 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
226 ft
3 main spans
Daily traffic
880
2019 count
Owner
State
State Highway Agency

About this bridge

Mn 6 over Mississippi River is a prestressed concrete stringer/multi-beam or girder carrying Mn 6 over Mississippi River in Itasca County, Minnesota. It was built in 1983, so it is 42 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 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 880 vehicles a day, roughly 15% of them trucks, projected to reach 940 by 2039. The structure is 226 ft (68.9 m) long and 46 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

CarriesMn 6
CrossesMississippi River
Location6.5 MI SW of JCT TH 2
RouteState Highway 6
Coordinates47.22906, -93.75802
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating92.2 US tons
Inventory rating37.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length226 ft (68.9 m)
Longest span74 ft (22.6 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic880 (2019)
Projected traffic940 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemNo

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 Mn 6 over Mississippi River built?

It was built in 1983, making it 42 years old in 2025.

What condition is Mn 6 over Mississippi 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 Mn 6 over Mississippi River carry?

About 880 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is Mn 6 over Mississippi River?

The structure is 226 ft (68.9 m) long with a longest span of 74 ft (22.6 m) and a deck 46 ft wide.

Who owns Mn 6 over Mississippi River?

It is owned by the State Highway Agency.