US Bridges

Medary Avenue over Six Mile Ck

Good

Brookings County, South Dakota · Medary Ave N Bypass Brkgs · Structure no. 000000006170147

Built
1987
38 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
99 ft
3 main spans
Daily traffic
3,213
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Medary Avenue over Six Mile Ck is a concrete continuous slab carrying Medary Avenue over Six Mile Ck in Brookings County, South Dakota. It was built in 1987, so it is 38 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 3,213 vehicles a day, roughly 8% of them trucks, projected to reach 3,213 by 2032. The structure is 99 ft (30.3 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMedary Avenue
CrossesSix Mile Ck
LocationMedary Ave N Bypass Brkgs
RouteCity Street 0
Coordinates44.33082, -96.78817
Functional classUrban Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating82 US tons
Inventory rating49.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length99 ft (30.3 m)
Longest span35 ft (10.7 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,213 (2022)
Projected traffic3,213 by 2032
Trucks8%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Medary Avenue over Six Mile Ck built?

It was built in 1987, making it 38 years old in 2025.

What condition is Medary Avenue over Six Mile 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 August 2023.

How much traffic does Medary Avenue over Six Mile Ck carry?

About 3,213 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Medary Avenue over Six Mile Ck?

The structure is 99 ft (30.3 m) long with a longest span of 35 ft (10.7 m) and a deck 47 ft wide.

Who owns Medary Avenue over Six Mile Ck?

It is owned by the City or Municipal Highway Agency.