US Bridges

Mn 1 over Red Lake River

Fair

Clearwater County, Minnesota · 4.9 MI S of N CO Line · Structure no. 15005

Built
1992
33 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
239 ft
3 main spans
Daily traffic
230
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 1 over Red Lake River is a prestressed concrete stringer/multi-beam or girder carrying Mn 1 over Red Lake River in Clearwater County, Minnesota. It was built in 1992, so it is 33 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 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 230 vehicles a day, roughly 15% of them trucks, projected to reach 235 by 2038. The structure is 239 ft (72.7 m) long and 38 ft wide. If it were closed, the detour would be 70.8 mi (114 km).

CarriesMn 1
CrossesRed Lake River
Location4.9 MI S of N CO Line
RouteState Highway 1
Coordinates47.96019, -95.27541
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68 US tons
Inventory rating43.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length239 ft (72.7 m)
Longest span80 ft (24.4 m)
Deck width38 ft (11.6 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2018)
Projected traffic235 by 2038
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.8 mi (114 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 1 over Red Lake River built?

It was built in 1992, making it 33 years old in 2025.

What condition is Mn 1 over Red Lake 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 May 2023.

How much traffic does Mn 1 over Red Lake River carry?

About 230 vehicles per day (2018 count), of which roughly 15% are trucks.

How long is Mn 1 over Red Lake River?

The structure is 239 ft (72.7 m) long with a longest span of 80 ft (24.4 m) and a deck 38 ft wide.

Who owns Mn 1 over Red Lake River?

It is owned by the State Highway Agency.