US Bridges

480th Avenue over Medary Ck

Good

Brookings County, South Dakota · 3.4N & 6W Elkton · Structure no. 000000006260176

Built
1989
36 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete Continuous
Length
50 ft
4 main spans
Daily traffic
92
2022 count
Owner
County
County Highway Agency

About this bridge

480th Avenue over Medary Ck is a concrete continuous culvert carrying 480th Avenue over Medary Ck in Brookings County, South Dakota. It was built in 1989, so it is 36 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 92 vehicles a day, roughly 2% of them trucks, projected to reach 92 by 2032. The structure is 50 ft (15.1 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Carries480th Avenue
CrossesMedary Ck
Location3.4N & 6W Elkton
RouteCounty Highway 0
Coordinates44.28632, -96.60759
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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating50.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20 + Mod
Structure length50 ft (15.1 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic92 (2022)
Projected traffic92 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$717,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 480th Avenue over Medary Ck built?

It was built in 1989, making it 36 years old in 2025.

What condition is 480th Avenue over 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 480th Avenue over Medary Ck carry?

About 92 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 480th Avenue over Medary Ck?

The structure is 50 ft (15.1 m) long with a longest span of 12 ft (3.7 m).

Who owns 480th Avenue over Medary Ck?

It is owned by the County Highway Agency.