US Bridges

Mn 27 over Rum River

Fair

Mille Lacs County, Minnesota · 0.8 MI W of Onamia · Structure no. 6860

Built
1955
70 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
41 ft
3 main spans
Daily traffic
1,337
2021 count
Owner
State
State Highway Agency

About this bridge

Mn 27 over Rum River is a concrete culvert carrying Mn 27 over Rum River in Mille Lacs County, Minnesota. It was built in 1955, so it is 70 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 1,337 vehicles a day, roughly 5% of them trucks, projected to reach 1,350 by 2041. The structure is 41 ft (12.6 m) long. If it were closed, the detour would be 62.1 mi (100 km).

Location

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CarriesMn 27
CrossesRum River
Location0.8 MI W of Onamia
RouteState Highway 27
CountyMille Lacs County
StateMinnesota
Coordinates46.06894, -93.68027
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating43.2 US tons
Inventory rating32.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length41 ft (12.6 m)
Longest span15 ft (4.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,337 (2021)
Projected traffic1,350 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed62.1 mi (100 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$73 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 27 over Rum River built?

It was built in 1955, making it 70 years old in 2025.

What condition is Mn 27 over Rum 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 27 over Rum River carry?

About 1,337 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Mn 27 over Rum River?

The structure is 41 ft (12.6 m) long with a longest span of 15 ft (4.5 m).

Who owns Mn 27 over Rum River?

It is owned by the State Highway Agency.