US Bridges

Mn 9 over Marsh River

Fair

Norman County, Minnesota · 0.3 MI S of JCT TH 200 · Structure no. 6694

Built
1948
77 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
99 ft
3 main spans
Daily traffic
1,650
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 9 over Marsh River is a concrete continuous slab carrying Mn 9 over Marsh River in Norman County, Minnesota. It was built in 1948, so it is 77 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 1,650 vehicles a day, roughly 9% of them trucks, projected to reach 1,800 by 2038. The structure is 99 ft (30.2 m) long and 51 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesMn 9
CrossesMarsh River
Location0.3 MI S of JCT TH 200
RouteState Highway 9
CountyNorman County
StateMinnesota
Coordinates47.2912, -96.51223
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.
Superstructure7 GoodSome minor problems.
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 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 alignment7: Better than present minimum criteria
Operating rating86.9 US tons
Inventory rating52 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length99 ft (30.2 m)
Longest span33 ft (10.1 m)
Deck width51 ft (15.4 m)
Roadway width47 ft (14.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2018)
Projected traffic1,800 by 2038
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 9 over Marsh River built?

It was built in 1948, making it 77 years old in 2025.

What condition is Mn 9 over Marsh 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 9 over Marsh River carry?

About 1,650 vehicles per day (2018 count), of which roughly 9% are trucks.

How long is Mn 9 over Marsh River?

The structure is 99 ft (30.2 m) long with a longest span of 33 ft (10.1 m) and a deck 51 ft wide.

Who owns Mn 9 over Marsh River?

It is owned by the State Highway Agency.