US Bridges

Nfa 1794 over Duncan Branch

Fair

Humphreys County, Tennessee · 6 MI W SR13 3 MI N of I40 · Structure no. 43017940009

Built
1984
41 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
61
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1794 over Duncan Branch is a concrete continuous culvert carrying Nfa 1794 over Duncan Branch in Humphreys County, Tennessee. It was built in 1984, so it is 41 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 61 vehicles a day, roughly 2% of them trucks, projected to reach 98 by 2042. The structure is 33 ft (10.1 m) long and 26 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNfa 1794
CrossesDuncan Branch
Location6 MI W SR13 3 MI N of I40
RouteCounty Highway 1794
CountyHumphreys County
StateTennessee
Coordinates35.90955, -87.90437
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 length33 ft (10.1 m)
Longest span15 ft (4.6 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic61 (2021)
Projected traffic98 by 2042
Trucks2%
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 1794 over Duncan Branch built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nfa 1794 over Duncan 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 November 2023.

How much traffic does Nfa 1794 over Duncan Branch carry?

About 61 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Nfa 1794 over Duncan Branch?

The structure is 33 ft (10.1 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns Nfa 1794 over Duncan Branch?

It is owned by the County Highway Agency.