US Bridges

Mn 1 over Snake River

Fair

Marshall County, Minnesota · 0.3 MI W of JCT TH 75 · Structure no. 45002

Built
1971
54 years old, rebuilt 2002
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
124 ft
4 main spans
Daily traffic
1,800
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 1 over Snake River is a concrete continuous slab carrying Mn 1 over Snake River in Marshall County, Minnesota. It was built in 1971 and reconstructed in 2002, so it is 54 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 1,800 vehicles a day, roughly 12% of them trucks, projected to reach 1,650 by 2038. The structure is 124 ft (37.9 m) long and 57 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMn 1
CrossesSnake River
Location0.3 MI W of JCT TH 75
RouteState Highway 1
CountyMarshall County
StateMinnesota
Coordinates48.19513, -96.77938
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length124 ft (37.9 m)
Longest span31 ft (9.5 m)
Deck width57 ft (17.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,800 (2018)
Projected traffic1,650 by 2038
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$440 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 1 over Snake River built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2002.

What condition is Mn 1 over Snake 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 September 2023.

How much traffic does Mn 1 over Snake River carry?

About 1,800 vehicles per day (2018 count), of which roughly 12% are trucks.

How long is Mn 1 over Snake River?

The structure is 124 ft (37.9 m) long with a longest span of 31 ft (9.5 m) and a deck 57 ft wide.

Who owns Mn 1 over Snake River?

It is owned by the State Highway Agency.