US Bridges

189th Street over Big Sioux River

Good

Hamlin County, South Dakota · 2W & 1N of Dempster · Structure no. 000000029247110

Built
2008
17 years old
Condition
Good
inspected July 2024
Type
Slab
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

189th Street over Big Sioux River is a concrete continuous slab carrying 189th Street over Big Sioux River in Hamlin County, South Dakota. It was built in 2008, so it is 17 years old, younger than the South Dakota average of 48.9 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 45 vehicles a day, roughly 2% of them trucks, projected to reach 45 by 2032. The structure is 90 ft (27.3 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries189th Street
CrossesBig Sioux River
Location2W & 1N of Dempster
Coordinates44.64499, -96.9907
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating49.3 US tons
Inventory rating38 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length90 ft (27.3 m)
Longest span33 ft (10.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2032
Trucks2%
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 189th Street over Big Sioux River built?

It was built in 2008, making it 17 years old in 2025.

What condition is 189th Street over Big 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 July 2024.

How much traffic does 189th Street over Big Sioux River carry?

About 45 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 189th Street over Big Sioux River?

The structure is 90 ft (27.3 m) long with a longest span of 33 ft (10.2 m) and a deck 31 ft wide.

Who owns 189th Street over Big Sioux River?

It is owned by the County Highway Agency.