US Bridges

Mn 20 over Little Cannon River

Good

Goodhue County, Minnesota · 0.1 MI N of JCT TH 19 · Structure no. 25011

Built
1995
30 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
114 ft
1 main span
Daily traffic
6,900
2019 count
Owner
State
State Highway Agency

About this bridge

Mn 20 over Little Cannon River is a prestressed concrete stringer/multi-beam or girder carrying Mn 20 over Little Cannon River in Goodhue County, Minnesota. It was built in 1995, so it is 30 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 6,900 vehicles a day, roughly 9% of them trucks, projected to reach 7,100 by 2039. The structure is 114 ft (34.7 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMn 20
CrossesLittle Cannon River
Location0.1 MI N of JCT TH 19
RouteState Highway 20
Coordinates44.51047, -92.90604
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 protection7 GoodSome minor problems.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.8 US tons
Inventory rating51 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length114 ft (34.7 m)
Longest span109 ft (33.2 m)
Deck width58 ft (17.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,900 (2019)
Projected traffic7,100 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 20 over Little Cannon River built?

It was built in 1995, making it 30 years old in 2025.

What condition is Mn 20 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 June 2023.

How much traffic does Mn 20 over Little Cannon River carry?

About 6,900 vehicles per day (2019 count), of which roughly 9% are trucks.

How long is Mn 20 over Little Cannon River?

The structure is 114 ft (34.7 m) long with a longest span of 109 ft (33.2 m) and a deck 58 ft wide.

Who owns Mn 20 over Little Cannon River?

It is owned by the State Highway Agency.