US Bridges

US014 B over Six Mile Ck

Fair

Brookings County, South Dakota · 2.0 W I 29 Interch · Structure no. 000000006166150

Built
1967
58 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
113 ft
3 main spans
Daily traffic
9,030
2024 count
Owner
State
State Highway Agency

About this bridge

US014 B over Six Mile Ck is a concrete continuous slab carrying US014 B over Six Mile Ck in Brookings County, South Dakota. It was built in 1967, so it is 58 years old, older than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 9,030 vehicles a day, roughly 9% of them trucks, projected to reach 12,507 by 2044. The structure is 113 ft (34.3 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesUS014 B
CrossesSix Mile Ck
Location2.0 W I 29 Interch
RouteU.S. Route 14
Coordinates44.32611, -96.79751
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.4 US tons
Inventory rating39.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.3 m)
Longest span40 ft (12.3 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,030 (2024)
Projected traffic12,507 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$100,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US014 B over Six Mile Ck built?

It was built in 1967, making it 58 years old in 2025.

What condition is US014 B over Six Mile Ck in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does US014 B over Six Mile Ck carry?

About 9,030 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is US014 B over Six Mile Ck?

The structure is 113 ft (34.3 m) long with a longest span of 40 ft (12.3 m) and a deck 47 ft wide.

Who owns US014 B over Six Mile Ck?

It is owned by the State Highway Agency.