US Bridges

Nfa 843 (sa 7408) over Branch

Good

Robertson County, Tennessee · 4.1 MI NE JCT SR25&I24 · Structure no. 74004370007

Built
1978
47 years old
Condition
Good
inspected May 2024
Type
Culvert
Concrete
Length
28 ft
1 main span
Daily traffic
461
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 843 (sa 7408) over Branch is a concrete culvert carrying Nfa 843 (sa 7408) over Branch in Robertson County, Tennessee. It was built in 1978, so it is 47 years old, younger than the Tennessee average of 47.4 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 461 vehicles a day, roughly 3% of them trucks, projected to reach 656 by 2040. The structure is 28 ft (8.5 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa 843 (sa 7408)
CrossesBranch
Location4.1 MI NE JCT SR25&I24
RouteCounty Highway 843
CountyRobertson County
StateTennessee
Coordinates36.48713, -87.04317
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span18 ft (5.5 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic461 (2021)
Projected traffic656 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 843 (sa 7408) over Branch built?

It was built in 1978, making it 47 years old in 2025.

What condition is Nfa 843 (sa 7408) over 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 May 2024.

How much traffic does Nfa 843 (sa 7408) over Branch carry?

About 461 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 843 (sa 7408) over Branch?

The structure is 28 ft (8.5 m) long with a longest span of 18 ft (5.5 m) and a deck 31 ft wide.

Who owns Nfa 843 (sa 7408) over Branch?

It is owned by the County Highway Agency.