US Bridges

Mn 1 over Snake River

Fair

Marshall County, Minnesota · 0.3 MI W of JCT TH 220 · Structure no. 45001

Built
1969
56 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
112 ft
4 main spans
Daily traffic
1,050
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 1969, so it is 56 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 1,050 vehicles a day, roughly 13% of them trucks, projected to reach 1,090 by 2038. The structure is 112 ft (34.2 m) long and 51 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 220
RouteState Highway 1
CountyMarshall County
StateMinnesota
Coordinates48.19497, -97.00544
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 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.1 US tons
Inventory rating48.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length112 ft (34.2 m)
Longest span31 ft (9.5 m)
Deck width51 ft (15.5 m)
Roadway width47 ft (14.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (2018)
Projected traffic1,090 by 2038
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 1 over Snake River built?

It was built in 1969, making it 56 years old in 2025.

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 August 2023.

How much traffic does Mn 1 over Snake River carry?

About 1,050 vehicles per day (2018 count), of which roughly 13% are trucks.

How long is Mn 1 over Snake River?

The structure is 112 ft (34.2 m) long with a longest span of 31 ft (9.5 m) and a deck 51 ft wide.

Who owns Mn 1 over Snake River?

It is owned by the State Highway Agency.