US Bridges

Csah 12 over Mn 60

Fair

Watonwan County, Minnesota · 3.0 MI NE of JCT TH 4 · Structure no. 83027

Built
1977
48 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
363 ft
4 main spans
Daily traffic
2,200
2016 count
Owner
State
State Highway Agency

About this bridge

Csah 12 over Mn 60 is a prestressed concrete stringer/multi-beam or girder carrying Csah 12 over Mn 60 in Watonwan County, Minnesota. It was built in 1977, so it is 48 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 2,200 vehicles a day, projected to reach 395 by 2036. The structure is 363 ft (110.7 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCsah 12
CrossesMn 60
Location3.0 MI NE of JCT TH 4
RouteCounty Highway 12
CountyWatonwan County
StateMinnesota
Coordinates43.97769, -94.58743
Functional classRural Major Collector

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 inspectionJuly 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 rating61.6 US tons
Inventory rating36.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length363 ft (110.7 m)
Longest span112 ft (34.1 m)
Deck width74 ft (22.6 m)
Roadway width54 ft (16.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2016)
Projected traffic395 by 2036
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Csah 12 over Mn 60 built?

It was built in 1977, making it 48 years old in 2025.

What condition is Csah 12 over Mn 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 July 2024.

How much traffic does Csah 12 over Mn 60 carry?

About 2,200 vehicles per day (2016 count).

How long is Csah 12 over Mn 60?

The structure is 363 ft (110.7 m) long with a longest span of 112 ft (34.1 m) and a deck 74 ft wide.

Who owns Csah 12 over Mn 60?

It is owned by the State Highway Agency.