US Bridges

Mn 3 over Cannon River

Fair

Rice County, Minnesota · 0.2 MI S of S JCT TH 19 · Structure no. 6865

Built
1956
69 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
263 ft
3 main spans
Daily traffic
19,968
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 3 over Cannon River is a steel continuous stringer/multi-beam or girder carrying Mn 3 over Cannon River in Rice County, Minnesota. It was built in 1956, so it is 69 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 19,968 vehicles a day, roughly 8% of them trucks, projected to reach 20,500 by 2042. The structure is 263 ft (80.1 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMn 3
CrossesCannon River
Location0.2 MI S of S JCT TH 19
RouteState Highway 3
CountyRice County
StateMinnesota
Coordinates44.45328, -93.16603
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating34.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length263 ft (80.1 m)
Longest span100 ft (30.5 m)
Deck width65 ft (19.7 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,968 (2022)
Projected traffic20,500 by 2042
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 3 over Cannon River built?

It was built in 1956, making it 69 years old in 2025.

What condition is Mn 3 over Cannon River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does Mn 3 over Cannon River carry?

About 19,968 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Mn 3 over Cannon River?

The structure is 263 ft (80.1 m) long with a longest span of 100 ft (30.5 m) and a deck 65 ft wide.

Who owns Mn 3 over Cannon River?

It is owned by the State Highway Agency.