US Bridges

US 90 over Nine Mile Bayou

Fair

Jackson County, Mississippi · 5.7 MI E SR 63 · Structure no. 21000900300805B

Built
1952
73 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
270 ft
9 main spans
Daily traffic
6,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 90 over Nine Mile Bayou is a concrete tee beam carrying US 90 over Nine Mile Bayou in Jackson County, Mississippi. It was built in 1952, so it is 73 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 6,500 vehicles a day, roughly 6% of them trucks, projected to reach 7,500 by 2043. The structure is 270 ft (82.3 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 90
CrossesNine Mile Bayou
Location5.7 MI E SR 63
RouteU.S. Route 90
CountyJackson County
StateMississippi
Coordinates30.43753, -88.43616
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating27.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 15
Structure length270 ft (82.3 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2023)
Projected traffic7,500 by 2043
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US 90 over Nine Mile Bayou built?

It was built in 1952, making it 73 years old in 2025.

What condition is US 90 over Nine Mile 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 August 2023.

How much traffic does US 90 over Nine Mile Bayou carry?

About 6,500 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 90 over Nine Mile Bayou?

The structure is 270 ft (82.3 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns US 90 over Nine Mile Bayou?

It is owned by the State Highway Agency.