US Bridges

US 278/SR 6 over Kay Bayou

Good

Coahoma County, Mississippi · 0.5 MI E US 61 · Structure no. 210027801401700

Built
2017
8 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
142 ft
1 main span
Daily traffic
4,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 278/SR 6 over Kay Bayou is a prestressed concrete stringer/multi-beam or girder carrying US 278/SR 6 over Kay Bayou in Coahoma County, Mississippi. It was built in 2017, so it is 8 years old, younger than the Mississippi average of 38.9 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 4,000 vehicles a day, roughly 15% of them trucks, projected to reach 4,000 by 2043. The structure is 142 ft (43.2 m) long and 47 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesUS 278/SR 6
CrossesKay Bayou
Location0.5 MI E US 61
RouteU.S. Route 278
CountyCoahoma County
StateMississippi
Coordinates34.21322, -90.521
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo 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
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.2 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHL 93
Structure length142 ft (43.2 m)
Longest span60 ft (18.3 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2023)
Projected traffic4,000 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 278/SR 6 over Kay Bayou built?

It was built in 2017, making it 8 years old in 2025.

What condition is US 278/SR 6 over Kay Bayou 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 US 278/SR 6 over Kay Bayou carry?

About 4,000 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 278/SR 6 over Kay Bayou?

The structure is 142 ft (43.2 m) long with a longest span of 60 ft (18.3 m) and a deck 47 ft wide.

Who owns US 278/SR 6 over Kay Bayou?

It is owned by the State Highway Agency.