US Bridges

Mn 84 over Norway Brook Dam

Good

Cass County, Minnesota · 0.28 MI E of Mn 371 · Structure no. 11011

Built
2021
4 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
211 ft
3 main spans
Daily traffic
3,064
2021 count
Owner
State
State Highway Agency

About this bridge

Mn 84 over Norway Brook Dam is a prestressed concrete stringer/multi-beam or girder carrying Mn 84 over Norway Brook Dam in Cass County, Minnesota. It was built in 2021, so it is 4 years old, younger than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,064 vehicles a day, roughly 9% of them trucks, projected to reach 3,620 by 2041. The structure is 211 ft (64.3 m) long and 51 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMn 84
CrossesNorway Brook Dam
Location0.28 MI E of Mn 371
RouteState Highway 84
CountyCass County
StateMinnesota
Coordinates46.72087, -94.40045
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length211 ft (64.3 m)
Longest span70 ft (21.4 m)
Deck width51 ft (15.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,064 (2021)
Projected traffic3,620 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 84 over Norway Brook Dam built?

It was built in 2021, making it 4 years old in 2025.

What condition is Mn 84 over Norway Brook Dam in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Mn 84 over Norway Brook Dam carry?

About 3,064 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is Mn 84 over Norway Brook Dam?

The structure is 211 ft (64.3 m) long with a longest span of 70 ft (21.4 m) and a deck 51 ft wide.

Who owns Mn 84 over Norway Brook Dam?

It is owned by the State Highway Agency.