US Bridges

Winn Road over Black Bayou

Fair

Washington County, Mississippi · Sec 6 T19N R 9W · Structure no. SA7600000000318

Built
1998
27 years old
Condition
Fair
inspected November 2024
Type
Channel Beam
Concrete
Length
107 ft
5 main spans
Daily traffic
50
2024 count
Owner
County
County Highway Agency

About this bridge

Winn Road over Black Bayou is a concrete channel beam carrying Winn Road over Black Bayou in Washington County, Mississippi. It was built in 1998, so it is 27 years old, younger than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 50 vehicles a day, roughly 8% of them trucks, projected to reach 70 by 2044. The structure is 107 ft (32.7 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesWinn Road
CrossesBlack Bayou
LocationSec 6 T19N R 9W
RouteCounty Highway 575
CountyWashington County
StateMississippi
Coordinates33.48881, -91.10689
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.9 US tons
Inventory rating26.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadH 15
Structure length107 ft (32.7 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic70 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$1.1 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Winn Road over Black Bayou built?

It was built in 1998, making it 27 years old in 2025.

What condition is Winn Road over Black Bayou 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 November 2024.

How much traffic does Winn Road over Black Bayou carry?

About 50 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Winn Road over Black Bayou?

The structure is 107 ft (32.7 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns Winn Road over Black Bayou?

It is owned by the County Highway Agency.