US Bridges

Nfa A508 over Henegar Branch

Good

Warren County, Tennessee · 4MI North of SR56 · Structure no. 890A5080001

Built
1994
31 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
80
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A508 over Henegar Branch is a concrete continuous culvert carrying Nfa A508 over Henegar Branch in Warren County, Tennessee. It was built in 1994, so it is 31 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 80 vehicles a day, roughly 2% of them trucks, projected to reach 128 by 2039. The structure is 26 ft (7.9 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNfa A508
CrossesHenegar Branch
Location4MI North of SR56
RouteCounty Highway 508
Coordinates35.66162, -85.8815
Functional classRural Local

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 2023
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 rating75.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width28 ft (8.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2020)
Projected traffic128 by 2039
Trucks2%
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 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 Nfa A508 over Henegar Branch built?

It was built in 1994, making it 31 years old in 2025.

What condition is Nfa A508 over Henegar 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 2023.

How much traffic does Nfa A508 over Henegar Branch carry?

About 80 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A508 over Henegar Branch?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 28 ft wide.

Who owns Nfa A508 over Henegar Branch?

It is owned by the County Highway Agency.