US Bridges

Mn 1 over Red River of the North

Fair

Marshall County, Minnesota · At N Dakota State Line · Structure no. 9100

Built
1959
66 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
792 ft
2 main spans
Daily traffic
1,450
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 1 over Red River of the North is a steel truss - thru carrying Mn 1 over Red River of the North in Marshall County, Minnesota. It was built in 1959, so it is 66 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 1,450 vehicles a day, roughly 12% of them trucks, projected to reach 1,550 by 2038. The structure is 792 ft (241.5 m) long and 33 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesMn 1
CrossesRed River of the North
LocationAt N Dakota State Line
RouteState Highway 1
CountyMarshall County
StateMinnesota
Coordinates48.19433, -97.14085
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating28.9 US tons
Inventory rating22.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+7 approach)
Design loadHS 20
Structure length792 ft (241.5 m)
Longest span220 ft (67.1 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic1,450 (2018)
Projected traffic1,550 by 2038
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 1 over Red River of the North built?

It was built in 1959, making it 66 years old in 2025.

What condition is Mn 1 over Red River of the North 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 June 2024.

How much traffic does Mn 1 over Red River of the North carry?

About 1,450 vehicles per day (2018 count), of which roughly 12% are trucks.

How long is Mn 1 over Red River of the North?

The structure is 792 ft (241.5 m) long with a longest span of 220 ft (67.1 m) and a deck 33 ft wide.

Who owns Mn 1 over Red River of the North?

It is owned by the State Highway Agency.