US Bridges

US014 W over Six Mile Ck

Fair

Brookings County, South Dakota · 1 SE JCT US 14 By-Pass · Structure no. 000000006159158

Built
1970
55 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
119 ft
3 main spans
Daily traffic
2,023
2024 count
Owner
State
State Highway Agency

About this bridge

US014 W over Six Mile Ck is a concrete continuous slab carrying US014 W over Six Mile Ck in Brookings County, South Dakota. It was built in 1970, so it is 55 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 2,023 vehicles a day, roughly 3% of them trucks, projected to reach 2,802 by 2044. The structure is 119 ft (36.3 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS014 W
CrossesSix Mile Ck
Location1 SE JCT US 14 By-Pass
RouteU.S. Route 14
Coordinates44.31443, -96.81139
Functional classUrban Minor 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 protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.5 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length119 ft (36.3 m)
Longest span43 ft (13.1 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,023 (2024)
Projected traffic2,802 by 2044
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$165,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US014 W over Six Mile Ck built?

It was built in 1970, making it 55 years old in 2025.

What condition is US014 W 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 August 2023.

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

About 2,023 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is US014 W over Six Mile Ck?

The structure is 119 ft (36.3 m) long with a longest span of 43 ft (13.1 m) and a deck 41 ft wide.

Who owns US014 W over Six Mile Ck?

It is owned by the State Highway Agency.