US Bridges

471st Avenue over Ck

Good

Brookings County, South Dakota · 7.9S Brookings · Structure no. 000000006169239

Built
2020
5 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
1,305
2022 count
Owner
County
County Highway Agency

About this bridge

471st Avenue over Ck is a concrete continuous slab carrying 471st Avenue over Ck in Brookings County, South Dakota. It was built in 2020, so it is 5 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 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 1,305 vehicles a day, roughly 3% of them trucks, projected to reach 1,305 by 2032. The structure is 90 ft (27.3 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries471st Avenue
CrossesCk
Location7.9S Brookings
RouteCounty Highway 0
Coordinates44.19592, -96.78949
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating57.7 US tons
Inventory rating44.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length90 ft (27.3 m)
Longest span33 ft (10.2 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,305 (2022)
Projected traffic1,305 by 2032
Trucks3%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 471st Avenue over Ck built?

It was built in 2020, making it 5 years old in 2025.

What condition is 471st Avenue over Ck 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 September 2024.

How much traffic does 471st Avenue over Ck carry?

About 1,305 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 471st Avenue over Ck?

The structure is 90 ft (27.3 m) long with a longest span of 33 ft (10.2 m) and a deck 32 ft wide.

Who owns 471st Avenue over Ck?

It is owned by the County Highway Agency.