US Bridges

Boyer Steiner Road over Porter Bayou

Fair

Sunflower County, Mississippi · Sec 19 T19N R 4W B · Structure no. SA6700000000063

Built
1974
51 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
200 ft
5 main spans
Daily traffic
660
2024 count
Owner
County
County Highway Agency

About this bridge

Boyer Steiner Road over Porter Bayou is a prestressed concrete stringer/multi-beam or girder carrying Boyer Steiner Road over Porter Bayou in Sunflower County, Mississippi. It was built in 1974, so it is 51 years old, older 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.

It carries about 660 vehicles a day, roughly 8% of them trucks, projected to reach 990 by 2044. The structure is 200 ft (61 m) long and 30 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesBoyer Steiner Road
CrossesPorter Bayou
LocationSec 19 T19N R 4W B
RouteCounty Highway 620
CountySunflower County
StateMississippi
Coordinates33.48851, -90.64289
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.9 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length200 ft (61 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic660 (2024)
Projected traffic990 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$1.4 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Boyer Steiner Road over Porter Bayou built?

It was built in 1974, making it 51 years old in 2025.

What condition is Boyer Steiner 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 October 2024.

How much traffic does Boyer Steiner Road over Porter Bayou carry?

About 660 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Boyer Steiner Road over Porter Bayou?

The structure is 200 ft (61 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Boyer Steiner Road over Porter Bayou?

It is owned by the County Highway Agency.