US Bridges

Mn 310 over Roseau River

Fair

Roseau County, Minnesota · 5.2 MI N of JCT TH11 · Structure no. 68002

Built
1972
53 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
429 ft
6 main spans
Daily traffic
350
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 310 over Roseau River is a steel continuous stringer/multi-beam or girder carrying Mn 310 over Roseau River in Roseau County, Minnesota. It was built in 1972, so it is 53 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 350 vehicles a day, roughly 10% of them trucks, projected to reach 345 by 2038. The structure is 429 ft (130.8 m) long and 44 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesMn 310
CrossesRoseau River
Location5.2 MI N of JCT TH11
RouteState Highway 310
CountyRoseau County
StateMinnesota
Coordinates48.92335, -95.76875
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating56.9 US tons
Inventory rating34.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length429 ft (130.8 m)
Longest span77 ft (23.5 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2018)
Projected traffic345 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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 310 over Roseau River built?

It was built in 1972, making it 53 years old in 2025.

What condition is Mn 310 over Roseau 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 Mn 310 over Roseau River carry?

About 350 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Mn 310 over Roseau River?

The structure is 429 ft (130.8 m) long with a longest span of 77 ft (23.5 m) and a deck 44 ft wide.

Who owns Mn 310 over Roseau River?

It is owned by the State Highway Agency.