US Bridges

Nfa A176 over Blackburn Fork

Good

Putnam County, Tennessee · .5MI from Jackson CO Line · Structure no. 710A1760001

Built
1978
47 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete Continuous
Length
39 ft
3 main spans
Daily traffic
70
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A176 over Blackburn Fork is a concrete continuous culvert carrying Nfa A176 over Blackburn Fork in Putnam 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 70 vehicles a day, roughly 2% of them trucks, projected to reach 112 by 2042. The structure is 39 ft (11.9 m) long and 24 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesNfa A176
CrossesBlackburn Fork
Location.5MI from Jackson CO Line
RouteCounty Highway 176
Coordinates36.23, -85.54565
Functional classUrban 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 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 rating66.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length39 ft (11.9 m)
Longest span12 ft (3.7 m)
Deck width24 ft (7.4 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2020)
Projected traffic112 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 A176 over Blackburn Fork built?

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

What condition is Nfa A176 over Blackburn Fork 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 September 2024.

How much traffic does Nfa A176 over Blackburn Fork carry?

About 70 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A176 over Blackburn Fork?

The structure is 39 ft (11.9 m) long with a longest span of 12 ft (3.7 m) and a deck 24 ft wide.

Who owns Nfa A176 over Blackburn Fork?

It is owned by the County Highway Agency.