US Bridges

Mn 73 over Kettle River

Good

Carlton County, Minnesota · 5.0 MI NW of W JCT TH 27 · Structure no. 09005

Built
1976
49 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
1,700
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 73 over Kettle River is a prestressed concrete stringer/multi-beam or girder carrying Mn 73 over Kettle River in Carlton County, Minnesota. It was built in 1976, so it is 49 years old, older 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 1,700 vehicles a day, roughly 4% of them trucks, projected to reach 1,850 by 2038. The structure is 100 ft (30.4 m) long and 51 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesMn 73
CrossesKettle River
Location5.0 MI NW of W JCT TH 27
RouteState Highway 73
Coordinates46.50871, -92.90497
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94 US tons
Inventory rating41 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length100 ft (30.4 m)
Longest span97 ft (29.6 m)
Deck width51 ft (15.5 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2018)
Projected traffic1,850 by 2038
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 73 over Kettle River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Mn 73 over Kettle River 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 June 2023.

How much traffic does Mn 73 over Kettle River carry?

About 1,700 vehicles per day (2018 count), of which roughly 4% are trucks.

How long is Mn 73 over Kettle River?

The structure is 100 ft (30.4 m) long with a longest span of 97 ft (29.6 m) and a deck 51 ft wide.

Who owns Mn 73 over Kettle River?

It is owned by the State Highway Agency.