US Bridges

T 339 over Little Cobb River

Good

Blue Earth County, Minnesota · 0.4 MI S of JCT Csah 10 · Structure no. 07568

Built
1993
32 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
117 ft
3 main spans
Daily traffic
29
1991 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 339 over Little Cobb River is a concrete continuous slab carrying T 339 over Little Cobb River in Blue Earth County, Minnesota. It was built in 1993, so it is 32 years old, younger than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 29 vehicles a day, projected to reach 29 by 2029. The structure is 117 ft (35.7 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesT 339
CrossesLittle Cobb River
Location0.4 MI S of JCT Csah 10
RouteCounty Highway 339
Coordinates44.00315, -93.88836
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.6 US tons
Inventory rating54.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length117 ft (35.7 m)
Longest span44 ft (13.4 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29 (1991)
Projected traffic29 by 2029
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 T 339 over Little Cobb River built?

It was built in 1993, making it 32 years old in 2025.

What condition is T 339 over Little Cobb River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does T 339 over Little Cobb River carry?

About 29 vehicles per day (1991 count).

How long is T 339 over Little Cobb River?

The structure is 117 ft (35.7 m) long with a longest span of 44 ft (13.4 m) and a deck 31 ft wide.

Who owns T 339 over Little Cobb River?

It is owned by the Town or Township Highway Agency.