US Bridges

Stephen Lyon Road over Porter Bayou

FairPosted for load

Sunflower County, Mississippi · Sec 1 T19N R 5W · Structure no. SA6700000000069

Built
1992
33 years old
Condition
Fair
inspected December 2024
Type
Other
Steel
Length
133 ft
2 main spans
Daily traffic
10
2023 count
Owner
County
County Highway Agency

About this bridge

Stephen Lyon Road over Porter Bayou is a steel other carrying Stephen Lyon Road over Porter Bayou in Sunflower County, Mississippi. It was built in 1992, so it is 33 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, roughly 8% of them trucks, projected to reach 30 by 2043. The structure is 133 ft (40.5 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesStephen Lyon Road
CrossesPorter Bayou
LocationSec 1 T19N R 5W
RouteCounty Highway 265
CountySunflower County
StateMississippi
Coordinates33.52707, -90.67017
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating3 US tons
Inventory rating3 US tons

Structure

Structure typeOther
MaterialSteel
DeckSteel plate
Main spans2
Design loadHS 20
Structure length133 ft (40.5 m)
Longest span89 ft (27.1 m)
Deck width27 ft (8.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic30 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$1.3 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stephen Lyon Road over Porter Bayou built?

It was built in 1992, making it 33 years old in 2025.

What condition is Stephen Lyon Road over Porter 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 December 2024.

How much traffic does Stephen Lyon Road over Porter Bayou carry?

About 10 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Stephen Lyon Road over Porter Bayou?

The structure is 133 ft (40.5 m) long with a longest span of 89 ft (27.1 m) and a deck 27 ft wide.

Who owns Stephen Lyon Road over Porter Bayou?

It is owned by the County Highway Agency.