US Bridges

Mn 56 over Little Cannon River

Good

Goodhue County, Minnesota · 4.4 MI N of JCT TH 60 · Structure no. 25016

Built
1987
38 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
84 ft
1 main span
Daily traffic
2,323
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 56 over Little Cannon River is a prestressed concrete stringer/multi-beam or girder carrying Mn 56 over Little Cannon River in Goodhue County, Minnesota. It was built in 1987, so it is 38 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 2,323 vehicles a day, roughly 21% of them trucks, projected to reach 1,750 by 2042. The structure is 84 ft (25.6 m) long and 46 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

CarriesMn 56
CrossesLittle Cannon River
Location4.4 MI N of JCT TH 60
RouteState Highway 56
Coordinates44.34183, -92.97991
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.1 US tons
Inventory rating42.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span79 ft (24.2 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,323 (2022)
Projected traffic1,750 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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 56 over Little Cannon River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Mn 56 over Little Cannon 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 July 2023.

How much traffic does Mn 56 over Little Cannon River carry?

About 2,323 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is Mn 56 over Little Cannon River?

The structure is 84 ft (25.6 m) long with a longest span of 79 ft (24.2 m) and a deck 46 ft wide.

Who owns Mn 56 over Little Cannon River?

It is owned by the State Highway Agency.