US Bridges

Csah 3 over Big Cobb River

Fair

Waseca County, Minnesota · 2.1 MI S of JCT TH 30 · Structure no. 81J10

Built
2011
14 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
586
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 3 over Big Cobb River is a concrete culvert carrying Csah 3 over Big Cobb River in Waseca County, Minnesota. It was built in 2011, so it is 14 years old, younger 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 6 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 586 vehicles a day, projected to reach 670 by 2041. The structure is 40 ft (12.1 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCsah 3
CrossesBig Cobb River
Location2.1 MI S of JCT TH 30
RouteCounty Highway 3
CountyWaseca County
StateMinnesota
Coordinates43.8615, -93.72759
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75.6 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 25 or greater
Structure length40 ft (12.1 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic586 (2021)
Projected traffic670 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Csah 3 over Big Cobb River built?

It was built in 2011, making it 14 years old in 2025.

What condition is Csah 3 over Big Cobb 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 November 2024.

How much traffic does Csah 3 over Big Cobb River carry?

About 586 vehicles per day (2021 count).

How long is Csah 3 over Big Cobb River?

The structure is 40 ft (12.1 m) long with a longest span of 12 ft (3.7 m).

Who owns Csah 3 over Big Cobb River?

It is owned by the County Highway Agency.