US Bridges

Mn 25 over Platte River

Fair

Morrison County, Minnesota · 8.5 MI N of Pierz · Structure no. 6321

Built
1938
87 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
1,483
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 25 over Platte River is a concrete culvert carrying Mn 25 over Platte River in Morrison County, Minnesota. It was built in 1938, so it is 87 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 1,483 vehicles a day, roughly 13% of them trucks, projected to reach 1,550 by 2042. The structure is 40 ft (12.2 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesMn 25
CrossesPlatte River
Location8.5 MI N of Pierz
RouteState Highway 25
CountyMorrison County
StateMinnesota
Coordinates46.09069, -94.10334
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating32.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,483 (2022)
Projected traffic1,550 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$51 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 25 over Platte River built?

It was built in 1938, making it 87 years old in 2025.

What condition is Mn 25 over Platte 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 July 2024.

How much traffic does Mn 25 over Platte River carry?

About 1,483 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Mn 25 over Platte River?

The structure is 40 ft (12.2 m) long with a longest span of 12 ft (3.7 m).

Who owns Mn 25 over Platte River?

It is owned by the State Highway Agency.