US Bridges

Nfa 1351 (sa 8604) over Dry Creek

Fair

Unicoi County, Tennessee · Btwn Erwin & Unicoi · Structure no. 86S24400005

Built
1976
49 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
1,607
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1351 (sa 8604) over Dry Creek is a concrete continuous culvert carrying Nfa 1351 (sa 8604) over Dry Creek in Unicoi County, Tennessee. It was built in 1976, so it is 49 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,607 vehicles a day, roughly 1% of them trucks, projected to reach 2,720 by 2040. The structure is 23 ft (6.9 m) long and 41 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa 1351 (sa 8604)
CrossesDry Creek
LocationBtwn Erwin & Unicoi
RouteCounty Highway 1351
CountyUnicoi County
StateTennessee
Coordinates36.18135, -82.37675
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (6.9 m)
Longest span11 ft (3.4 m)
Deck width41 ft (12.4 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,607 (2021)
Projected traffic2,720 by 2040
Trucks1%
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 1351 (sa 8604) over Dry Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Nfa 1351 (sa 8604) over Dry Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does Nfa 1351 (sa 8604) over Dry Creek carry?

About 1,607 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Nfa 1351 (sa 8604) over Dry Creek?

The structure is 23 ft (6.9 m) long with a longest span of 11 ft (3.4 m) and a deck 41 ft wide.

Who owns Nfa 1351 (sa 8604) over Dry Creek?

It is owned by the County Highway Agency.