US Bridges

Mn 15 over TH 60

Fair

Watonwan County, Minnesota · At the S JCT TH 60 · Structure no. 83005

Built
1975
50 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
329 ft
4 main spans
Daily traffic
6,600
2016 count
Owner
State
State Highway Agency

About this bridge

Mn 15 over TH 60 is a prestressed concrete stringer/multi-beam or girder carrying Mn 15 over TH 60 in Watonwan County, Minnesota. It was built in 1975, so it is 50 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 6,600 vehicles a day, roughly 12% of them trucks, projected to reach 6,600 by 2036. The structure is 329 ft (100.4 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMn 15
CrossesTH 60
LocationAt the S JCT TH 60
RouteState Highway 15
CountyWatonwan County
StateMinnesota
Coordinates43.98029, -94.43172
Functional classRural Principal Arterial - Other

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.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.6 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length329 ft (100.4 m)
Longest span97 ft (29.6 m)
Deck width60 ft (18.4 m)
Roadway width51 ft (15.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,600 (2016)
Projected traffic6,600 by 2036
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mn 15 over TH 60 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Mn 15 over TH 60 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 September 2024.

How much traffic does Mn 15 over TH 60 carry?

About 6,600 vehicles per day (2016 count), of which roughly 12% are trucks.

How long is Mn 15 over TH 60?

The structure is 329 ft (100.4 m) long with a longest span of 97 ft (29.6 m) and a deck 60 ft wide.

Who owns Mn 15 over TH 60?

It is owned by the State Highway Agency.