US Bridges

M 3 over Mille Lacs Lake

Good

Mille Lacs County, Minnesota · In Isle · Structure no. 48534

Built
2017
8 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete Continuous
Length
83 ft
3 main spans
Daily traffic
271
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

M 3 over Mille Lacs Lake is a concrete continuous slab carrying M 3 over Mille Lacs Lake in Mille Lacs County, Minnesota. It was built in 2017, so it is 8 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 271 vehicles a day, projected to reach 271 by 2036. The structure is 83 ft (25.3 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesM 3
CrossesMille Lacs Lake
LocationIn Isle
RouteCity Street 3
Coordinates46.14754, -93.46781
Functional classRural Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating55.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length83 ft (25.3 m)
Longest span31 ft (9.4 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic271 (2016)
Projected traffic271 by 2036
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 M 3 over Mille Lacs Lake built?

It was built in 2017, making it 8 years old in 2025.

What condition is M 3 over Mille Lacs Lake 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 2024.

How much traffic does M 3 over Mille Lacs Lake carry?

About 271 vehicles per day (2016 count).

How long is M 3 over Mille Lacs Lake?

The structure is 83 ft (25.3 m) long with a longest span of 31 ft (9.4 m) and a deck 31 ft wide.

Who owns M 3 over Mille Lacs Lake?

It is owned by the City or Municipal Highway Agency.