US Bridges

Four Mile Road over Browns Bayou

Fair

Sunflower County, Mississippi · Sec 13 T17N R 4W B · Structure no. SA6700000000012

Built
1994
31 years old
Condition
Fair
inspected September 2024
Type
Channel Beam
Concrete
Length
248 ft
8 main spans
Daily traffic
550
2024 count
Owner
County
County Highway Agency

About this bridge

Four Mile Road over Browns Bayou is a concrete channel beam carrying Four Mile Road over Browns Bayou in Sunflower County, Mississippi. It was built in 1994, so it is 31 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 550 vehicles a day, roughly 8% of them trucks, projected to reach 825 by 2044. The structure is 248 ft (75.6 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFour Mile Road
CrossesBrowns Bayou
LocationSec 13 T17N R 4W B
RouteCounty Highway 1639
Coordinates33.32268, -90.55577
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.9 US tons
Inventory rating39.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans8
Design loadHS 20
Structure length248 ft (75.6 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2024)
Projected traffic825 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$1.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Four Mile Road over Browns Bayou built?

It was built in 1994, making it 31 years old in 2025.

What condition is Four Mile Road over Browns 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 September 2024.

How much traffic does Four Mile Road over Browns Bayou carry?

About 550 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Four Mile Road over Browns Bayou?

The structure is 248 ft (75.6 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns Four Mile Road over Browns Bayou?

It is owned by the County Highway Agency.