US Bridges

Nfa 1351 (sa 8604) over CSX Railroad

Fair

Unicoi County, Tennessee · Btwn Old & New SR36-ERWIN · Structure no. 86013510009

Built
1981
44 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
161 ft
3 main spans
Daily traffic
5,148
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1351 (sa 8604) over CSX Railroad is a prestressed concrete continuous box beam or girders - multiple carrying Nfa 1351 (sa 8604) over CSX Railroad in Unicoi County, Tennessee. It was built in 1981, so it is 44 years old, younger 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 5,148 vehicles a day, roughly 3% of them trucks, projected to reach 14,208 by 2040. The structure is 161 ft (49.2 m) long and 51 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesNfa 1351 (sa 8604)
CrossesCSX Railroad
LocationBtwn Old & New SR36-ERWIN
RouteCounty Highway 1351
CountyUnicoi County
StateTennessee
Coordinates36.16307, -82.39606
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating30.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadUnknown
Structure length161 ft (49.2 m)
Longest span63 ft (19.2 m)
Deck width51 ft (15.4 m)
Roadway width47 ft (14.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,148 (2021)
Projected traffic14,208 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed9.9 mi (16 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa 1351 (sa 8604) over CSX Railroad built?

It was built in 1981, making it 44 years old in 2025.

What condition is Nfa 1351 (sa 8604) over CSX Railroad 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 CSX Railroad carry?

About 5,148 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1351 (sa 8604) over CSX Railroad?

The structure is 161 ft (49.2 m) long with a longest span of 63 ft (19.2 m) and a deck 51 ft wide.

Who owns Nfa 1351 (sa 8604) over CSX Railroad?

It is owned by the County Highway Agency.