US Bridges

Nfa 1781 (sa 4311) over Black Branch

Fair

Humphreys County, Tennessee · 2 M. NW SR 13. · Structure no. 43017810003

Built
1982
43 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete Continuous
Length
47 ft
2 main spans
Daily traffic
668
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1781 (sa 4311) over Black Branch is a concrete continuous culvert carrying Nfa 1781 (sa 4311) over Black Branch in Humphreys County, Tennessee. It was built in 1982, so it is 43 years old, younger 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 668 vehicles a day, roughly 3% of them trucks, projected to reach 1,069 by 2042. The structure is 47 ft (14.3 m) long and 28 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNfa 1781 (sa 4311)
CrossesBlack Branch
Location2 M. NW SR 13.
RouteCounty Highway 1781
CountyHumphreys County
StateTennessee
Coordinates36.22315, -87.76395
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic668 (2021)
Projected traffic1,069 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 1781 (sa 4311) over Black Branch built?

It was built in 1982, making it 43 years old in 2025.

What condition is Nfa 1781 (sa 4311) over Black Branch 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 Nfa 1781 (sa 4311) over Black Branch carry?

About 668 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1781 (sa 4311) over Black Branch?

The structure is 47 ft (14.3 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns Nfa 1781 (sa 4311) over Black Branch?

It is owned by the County Highway Agency.