US Bridges

US 49 over Flat Branch

Good

Harrison County, Mississippi · 3.1 MI N I 10 · Structure no. 21000490240081B

Built
2021
4 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
201 ft
1 main span
Daily traffic
13,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 49 over Flat Branch is a prestressed concrete stringer/multi-beam or girder carrying US 49 over Flat Branch in Harrison County, Mississippi. It was built in 2021, so it is 4 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,000 vehicles a day, roughly 8% of them trucks, projected to reach 13,000 by 2043. The structure is 201 ft (61.4 m) long and 57 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 49
CrossesFlat Branch
Location3.1 MI N I 10
RouteU.S. Route 49
Coordinates30.47659, -89.10299
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating41.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadHL 93
Structure length201 ft (61.4 m)
Longest span80 ft (24.4 m)
Deck width57 ft (17.3 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2023)
Projected traffic13,000 by 2043
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 49 over Flat Branch built?

It was built in 2021, making it 4 years old in 2025.

What condition is US 49 over Flat Branch 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 April 2023.

How much traffic does US 49 over Flat Branch carry?

About 13,000 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 49 over Flat Branch?

The structure is 201 ft (61.4 m) long with a longest span of 80 ft (24.4 m) and a deck 57 ft wide.

Who owns US 49 over Flat Branch?

It is owned by the State Highway Agency.