US Bridges

Csah 3 over Mn 15

Fair

Watonwan County, Minnesota · 0.4 MI S of JCT TH 60 · Structure no. 83012

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
301 ft
4 main spans
Daily traffic
630
2016 count
Owner
State
State Highway Agency

About this bridge

Csah 3 over Mn 15 is a prestressed concrete stringer/multi-beam or girder carrying Csah 3 over Mn 15 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 630 vehicles a day, projected to reach 630 by 2039. The structure is 301 ft (91.7 m) long and 58 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 3
CrossesMn 15
Location0.4 MI S of JCT TH 60
RouteCounty Highway 3
CountyWatonwan County
StateMinnesota
Coordinates44.0508, -94.40115
Functional classRural Minor 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.
Last inspectionAugust 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 geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.3 US tons
Inventory rating43.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length301 ft (91.7 m)
Longest span89 ft (27 m)
Deck width58 ft (17.8 m)
Roadway width54 ft (16.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic630 (2016)
Projected traffic630 by 2039
Trucks—
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 3 over Mn 15 built?

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

What condition is Csah 3 over Mn 15 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 August 2024.

How much traffic does Csah 3 over Mn 15 carry?

About 630 vehicles per day (2016 count).

How long is Csah 3 over Mn 15?

The structure is 301 ft (91.7 m) long with a longest span of 89 ft (27 m) and a deck 58 ft wide.

Who owns Csah 3 over Mn 15?

It is owned by the State Highway Agency.