US Bridges

Nfa A405 over Blair Creek

Good

Claiborne County, Tennessee · 3.5 M Sse of US25E-SR63 J · Structure no. 130A4050001

Built
1984
41 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
34 ft
2 main spans
Daily traffic
50
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A405 over Blair Creek is a concrete continuous culvert carrying Nfa A405 over Blair Creek in Claiborne 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 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 80 by 2041. The structure is 34 ft (10.3 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa A405
CrossesBlair Creek
Location3.5 M Sse of US25E-SR63 J
RouteCounty Highway 405
CountyClaiborne County
StateTennessee
Coordinates36.52043, -83.63628
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJune 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 alignment6: Equal to present minimum criteria
Operating rating57.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length34 ft (10.3 m)
Longest span15 ft (4.7 m)
Deck width27 ft (8.1 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2020)
Projected traffic80 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 A405 over Blair Creek built?

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

What condition is Nfa A405 over Blair Creek 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 June 2023.

How much traffic does Nfa A405 over Blair Creek carry?

About 50 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Nfa A405 over Blair Creek?

The structure is 34 ft (10.3 m) long with a longest span of 15 ft (4.7 m) and a deck 27 ft wide.

Who owns Nfa A405 over Blair Creek?

It is owned by the County Highway Agency.