US Bridges

Nfa A004 (sa 8217) over Boone Lake

Fair

Sullivan County, Tennessee · On Wash CO Li-W of US11E · Structure no. 82F00290001

Built
1952
73 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
659 ft
8 main spans
Daily traffic
1,930
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A004 (sa 8217) over Boone Lake is a steel continuous stringer/multi-beam or girder carrying Nfa A004 (sa 8217) over Boone Lake in Sullivan County, Tennessee. It was built in 1952, so it is 73 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 5 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 1,930 vehicles a day, roughly 1% of them trucks, projected to reach 3,088 by 2042. The structure is 659 ft (200.8 m) long and 22 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNfa A004 (sa 8217)
CrossesBoone Lake
LocationOn Wash CO Li-W of US11E
RouteCounty Highway 4
CountySullivan County
StateTennessee
Coordinates36.41943, -82.37435
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length659 ft (200.8 m)
Longest span73 ft (22.3 m)
Deck width22 ft (6.6 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,930 (2020)
Projected traffic3,088 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$3.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A004 (sa 8217) over Boone Lake built?

It was built in 1952, making it 73 years old in 2025.

What condition is Nfa A004 (sa 8217) over Boone Lake 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 February 2024.

How much traffic does Nfa A004 (sa 8217) over Boone Lake carry?

About 1,930 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa A004 (sa 8217) over Boone Lake?

The structure is 659 ft (200.8 m) long with a longest span of 73 ft (22.3 m) and a deck 22 ft wide.

Who owns Nfa A004 (sa 8217) over Boone Lake?

It is owned by the County Highway Agency.