US Bridges

Csah 16 over Little Cobb River

FairPosted for load

Blue Earth County, Minnesota · 0.3 MI NW of JCT CR 168 · Structure no. 07503

Built
1961
64 years old
Condition
Fair
inspected October 2024
Type
Channel Beam
Prestressed Concrete
Length
94 ft
3 main spans
Daily traffic
174
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 16 over Little Cobb River is a prestressed concrete channel beam carrying Csah 16 over Little Cobb River in Blue Earth County, Minnesota. It was built in 1961, so it is 64 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. Its operating status is: posted for load restriction.

It carries about 174 vehicles a day, projected to reach 160 by 2042. The structure is 94 ft (28.5 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 16
CrossesLittle Cobb River
Location0.3 MI NW of JCT CR 168
RouteCounty Highway 16
CountyBlue Earth County
StateMinnesota
Coordinates43.99656, -93.90912
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating31.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length94 ft (28.5 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic174 (2022)
Projected traffic160 by 2042
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$432 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 16 over Little Cobb River built?

It was built in 1961, making it 64 years old in 2025.

What condition is Csah 16 over Little 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 Csah 16 over Little Cobb River carry?

About 174 vehicles per day (2022 count).

How long is Csah 16 over Little Cobb River?

The structure is 94 ft (28.5 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns Csah 16 over Little Cobb River?

It is owned by the County Highway Agency.