US Bridges

Mn 47 over Groundhouse River

Fair

Kanabec County, Minnesota · 0.4 MI N of JCT TH 23 · Structure no. 33001

Built
1965
60 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
108 ft
3 main spans
Daily traffic
1,613
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 47 over Groundhouse River is a steel stringer/multi-beam or girder carrying Mn 47 over Groundhouse River in Kanabec County, Minnesota. It was built in 1965, so it is 60 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 1,613 vehicles a day, roughly 7% of them trucks, projected to reach 1,500 by 2042. The structure is 108 ft (32.9 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMn 47
CrossesGroundhouse River
Location0.4 MI N of JCT TH 23
RouteState Highway 47
CountyKanabec County
StateMinnesota
Coordinates45.83385, -93.43139
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 geometry5: 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 rating67.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length108 ft (32.9 m)
Longest span43 ft (13 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,613 (2022)
Projected traffic1,500 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 47 over Groundhouse River built?

It was built in 1965, making it 60 years old in 2025.

What condition is Mn 47 over Groundhouse 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 2024.

How much traffic does Mn 47 over Groundhouse River carry?

About 1,613 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is Mn 47 over Groundhouse River?

The structure is 108 ft (32.9 m) long with a longest span of 43 ft (13 m) and a deck 35 ft wide.

Who owns Mn 47 over Groundhouse River?

It is owned by the State Highway Agency.