US Bridges

486th Avenue over Trib to Medary Ck

Good

Brookings County, South Dakota · 8.0E & 0.5N Bushnell · Structure no. 000000006320143

Built
2005
20 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
175
2022 count
Owner
County
County Highway Agency

About this bridge

486th Avenue over Trib to Medary Ck is a concrete continuous culvert carrying 486th Avenue over Trib to Medary Ck in Brookings County, South Dakota. It was built in 2005, so it is 20 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 175 vehicles a day, roughly 3% of them trucks, projected to reach 175 by 2032. The structure is 21 ft (6.3 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Carries486th Avenue
CrossesTrib to Medary Ck
Location8.0E & 0.5N Bushnell
RouteCounty Highway 0
Coordinates44.33502, -96.48647
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
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2022)
Projected traffic175 by 2032
Trucks3%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$460,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 486th Avenue over Trib to Medary Ck built?

It was built in 2005, making it 20 years old in 2025.

What condition is 486th Avenue over Trib to Medary 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 2023.

How much traffic does 486th Avenue over Trib to Medary Ck carry?

About 175 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 486th Avenue over Trib to Medary Ck?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns 486th Avenue over Trib to Medary Ck?

It is owned by the County Highway Agency.