US Bridges

CR 164 over Big Cobb River

Fair

Blue Earth County, Minnesota · 0.6 MI E of JCT Csah 52 · Structure no. 07593

Built
2011
14 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
66
2021 count
Owner
County
County Highway Agency

About this bridge

CR 164 over Big Cobb River is a prestressed concrete box beam or girders - multiple carrying CR 164 over Big Cobb River in Blue Earth 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 66 vehicles a day, projected to reach 80 by 2041. The structure is 70 ft (21.3 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCR 164
CrossesBig Cobb River
Location0.6 MI E of JCT Csah 52
RouteCounty Highway 164
Coordinates43.95673, -93.88555
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72.1 US tons
Inventory rating55.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span69 ft (21 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66 (2021)
Projected traffic80 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 CR 164 over Big Cobb River built?

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

What condition is CR 164 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 October 2024.

How much traffic does CR 164 over Big Cobb River carry?

About 66 vehicles per day (2021 count).

How long is CR 164 over Big Cobb River?

The structure is 70 ft (21.3 m) long with a longest span of 69 ft (21 m) and a deck 33 ft wide.

Who owns CR 164 over Big Cobb River?

It is owned by the County Highway Agency.