US Bridges

Nfa B485 over Grubb Creek

Fair

Loudon County, Tennessee · 7.5 M. Nw. Lenoir City. · Structure no. 530A2350001

Built
1965
60 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
550
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa B485 over Grubb Creek is a concrete continuous culvert carrying Nfa B485 over Grubb Creek in Loudon County, Tennessee. It was built in 1965, so it is 60 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 550 vehicles a day, roughly 2% of them trucks, projected to reach 880 by 2042. The structure is 28 ft (8.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNfa B485
CrossesGrubb Creek
Location7.5 M. Nw. Lenoir City.
RouteCounty Highway 485
CountyLoudon County
StateTennessee
Coordinates35.87917, -84.33293
Functional classUrban 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: 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 rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length28 ft (8.4 m)
Longest span12 ft (3.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2020)
Projected traffic880 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 B485 over Grubb Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Nfa B485 over Grubb 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 August 2024.

How much traffic does Nfa B485 over Grubb Creek carry?

About 550 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa B485 over Grubb Creek?

The structure is 28 ft (8.4 m) long with a longest span of 12 ft (3.8 m).

Who owns Nfa B485 over Grubb Creek?

It is owned by the County Highway Agency.