US Bridges

Back Bay Blvd over Bay Bayou

Good

Harrison County, Mississippi · Sec 33 T 7S R 9W · Structure no. SA2400000000185

Built
2003
22 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
2,500
2012 count
Owner
City
City or Municipal Highway Agency

About this bridge

Back Bay Blvd over Bay Bayou is a prestressed concrete stringer/multi-beam or girder carrying Back Bay Blvd over Bay Bayou in Harrison County, Mississippi. It was built in 2003, so it is 22 years old, younger than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,500 vehicles a day, roughly 8% of them trucks, projected to reach 3,500 by 2032. The structure is 40 ft (12.2 m) long and 77 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

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CarriesBack Bay Blvd
CrossesBay Bayou
LocationSec 33 T 7S R 9W
RouteCity Street 25
CountyHarrison County
StateMississippi
Coordinates30.40592, -88.87467
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width77 ft (23.5 m)
Roadway width54 ft (16.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2012)
Projected traffic3,500 by 2032
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Back Bay Blvd over Bay Bayou built?

It was built in 2003, making it 22 years old in 2025.

What condition is Back Bay Blvd over Bay Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Back Bay Blvd over Bay Bayou carry?

About 2,500 vehicles per day (2012 count), of which roughly 8% are trucks.

How long is Back Bay Blvd over Bay Bayou?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 77 ft wide.

Who owns Back Bay Blvd over Bay Bayou?

It is owned by the City or Municipal Highway Agency.