US Bridges

T 170 over Little Sioux River

Good

Jackson County, Minnesota · 0.2 MI N of JCT Csah 34 · Structure no. 95011

Built
1979
46 years old
Condition
Good
inspected August 2024
Type
Culvert
Concrete
Length
46 ft
3 main spans
Daily traffic
15
1988 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 170 over Little Sioux River is a concrete culvert carrying T 170 over Little Sioux River in Jackson County, Minnesota. It was built in 1979, so it is 46 years old, older 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, projected to reach 15 by 2029. The structure is 46 ft (13.9 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesT 170
CrossesLittle Sioux River
Location0.2 MI N of JCT Csah 34
RouteCounty Highway 170
Coordinates43.61908, -95.2748
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.4 US tons
Inventory rating39.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length46 ft (13.9 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (1988)
Projected traffic15 by 2029
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

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$98 million
NavigationNo navigation control on waterway

Frequently asked questions

When was T 170 over Little Sioux River built?

It was built in 1979, making it 46 years old in 2025.

What condition is T 170 over Little Sioux 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 August 2024.

How much traffic does T 170 over Little Sioux River carry?

About 15 vehicles per day (1988 count).

How long is T 170 over Little Sioux River?

The structure is 46 ft (13.9 m) long with a longest span of 11 ft (3.5 m).

Who owns T 170 over Little Sioux River?

It is owned by the Town or Township Highway Agency.