US Bridges

M 6 over Tamarac River

Good

Marshall County, Minnesota · 0.1 MI S of JCT 5th ST · Structure no. 45539

Built
1985
40 years old
Condition
Good
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
154 ft
3 main spans
Daily traffic
30
1994 count
Owner
City
City or Municipal Highway Agency

About this bridge

M 6 over Tamarac River is a prestressed concrete tee beam carrying M 6 over Tamarac River in Marshall County, Minnesota. It was built in 1985, so it is 40 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, projected to reach 30 by 2029. The structure is 154 ft (46.9 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesM 6
CrossesTamarac River
Location0.1 MI S of JCT 5th ST
RouteCity Street 6
Coordinates48.44904, -96.87599
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating26.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span51 ft (15.6 m)
Deck width45 ft (13.7 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (1994)
Projected traffic30 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 6 over Tamarac River built?

It was built in 1985, making it 40 years old in 2025.

What condition is M 6 over Tamarac River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

How much traffic does M 6 over Tamarac River carry?

About 30 vehicles per day (1994 count).

How long is M 6 over Tamarac River?

The structure is 154 ft (46.9 m) long with a longest span of 51 ft (15.6 m) and a deck 45 ft wide.

Who owns M 6 over Tamarac River?

It is owned by the City or Municipal Highway Agency.