US Bridges

Nfa B518 over Black Bayou

Fair

Shelby County, Tennessee · Barron RD in Memphis · Structure no. 790B6240001

Built
1954
71 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
57 ft
3 main spans
Daily traffic
1,750
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa B518 over Black Bayou is a concrete continuous tee beam carrying Nfa B518 over Black Bayou in Shelby County, Tennessee. It was built in 1954, so it is 71 years old, older than the Tennessee average of 47.4 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 1,750 vehicles a day, roughly 2% of them trucks, projected to reach 2,800 by 2042. The structure is 57 ft (17.4 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNfa B518
CrossesBlack Bayou
LocationBarron RD in Memphis
RouteCity Street 518
CountyShelby County
StateTennessee
Coordinates35.09703, -89.93211
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length57 ft (17.4 m)
Longest span23 ft (7 m)
Deck width45 ft (13.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,750 (2020)
Projected traffic2,800 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa B518 over Black Bayou built?

It was built in 1954, making it 71 years old in 2025.

What condition is Nfa B518 over Black 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 March 2023.

How much traffic does Nfa B518 over Black Bayou carry?

About 1,750 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa B518 over Black Bayou?

The structure is 57 ft (17.4 m) long with a longest span of 23 ft (7 m) and a deck 45 ft wide.

Who owns Nfa B518 over Black Bayou?

It is owned by the City or Municipal Highway Agency.