US Bridges

SR 609 over Old Fort Bayou

Fair

Jackson County, Mississippi · 0.2 MI N US 90 · Structure no. 310060903000020

Built
1984
41 years old
Condition
Fair
inspected February 2023
Type
Movable - Bascule
Steel
Length
1,757 ft
1 main span
Daily traffic
35,000
2023 count
Owner
State
State Highway Agency

About this bridge

SR 609 over Old Fort Bayou is a steel movable - bascule carrying SR 609 over Old Fort Bayou in Jackson County, Mississippi. It was built in 1984, so it is 41 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 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 35,000 vehicles a day, roughly 4% of them trucks, projected to reach 35,000 by 2043. The structure is 1,757 ft (535.5 m) long and 68 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesSR 609
CrossesOld Fort Bayou
Location0.2 MI N US 90
RouteState Highway 609
CountyJackson County
StateMississippi
Coordinates30.41843, -88.82775
Functional classUrban Other Principal Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating67.7 US tons
Inventory rating39.6 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+16 approach)
Design loadHS 20
Structure length1,757 ft (535.5 m)
Longest span177 ft (53.9 m)
Deck width68 ft (20.8 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,000 (2023)
Projected traffic35,000 by 2043
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 609 over Old Fort Bayou built?

It was built in 1984, making it 41 years old in 2025.

What condition is SR 609 over Old Fort 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 February 2023.

How much traffic does SR 609 over Old Fort Bayou carry?

About 35,000 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 609 over Old Fort Bayou?

The structure is 1,757 ft (535.5 m) long with a longest span of 177 ft (53.9 m) and a deck 68 ft wide.

Who owns SR 609 over Old Fort Bayou?

It is owned by the State Highway Agency.