US Bridges

Nfa A277 over Rock Creek

Good

Unicoi County, Tennessee · N Off SR395 · Structure no. 860A2770001

Built
1992
33 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete Continuous
Length
30 ft
2 main spans
Daily traffic
90
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A277 over Rock Creek is a concrete continuous culvert carrying Nfa A277 over Rock Creek in Unicoi County, Tennessee. It was built in 1992, so it is 33 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 90 vehicles a day, roughly 6% of them trucks, projected to reach 144 by 2040. The structure is 30 ft (9.2 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNfa A277
CrossesRock Creek
LocationN Off SR395
RouteCounty Highway 277
Coordinates36.14042, -82.36107
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJuly 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 rating67.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length30 ft (9.2 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2020)
Projected traffic144 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 A277 over Rock Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is Nfa A277 over Rock 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 July 2024.

How much traffic does Nfa A277 over Rock Creek carry?

About 90 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Nfa A277 over Rock Creek?

The structure is 30 ft (9.2 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns Nfa A277 over Rock Creek?

It is owned by the County Highway Agency.