US Bridges

Csah 20 over Big Cobb River

Fair

Faribault County, Minnesota · 1.3 MI W of JCT Csah 35 · Structure no. 93205

Built
1976
49 years old
Condition
Fair
inspected May 2021
Type
Culvert
Concrete
Length
32 ft
2 main spans
Daily traffic
180
2015 count
Owner
County
County Highway Agency

About this bridge

Csah 20 over Big Cobb River is a concrete culvert carrying Csah 20 over Big Cobb River in Faribault County, Minnesota. It was built in 1976, so it is 49 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 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 180 vehicles a day, projected to reach 180 by 2039. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 20
CrossesBig Cobb River
Location1.3 MI W of JCT Csah 35
RouteCounty Highway 20
CountyFaribault County
StateMinnesota
Coordinates43.84792, -93.69348
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2021
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 alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating39.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2015)
Projected traffic180 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 20 over Big Cobb River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Csah 20 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 May 2021.

How much traffic does Csah 20 over Big Cobb River carry?

About 180 vehicles per day (2015 count).

How long is Csah 20 over Big Cobb River?

The structure is 32 ft (9.8 m) long with a longest span of 14 ft (4.3 m).

Who owns Csah 20 over Big Cobb River?

It is owned by the County Highway Agency.