US Bridges

Nfa 2422 (sa 4707) over Grable Creek

Fair

Knox County, Tennessee · Everett Rd-Near Loudon CO · Structure no. 47024220001

Built
1930
95 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete Continuous
Length
37 ft
2 main spans
Daily traffic
2,428
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 2422 (sa 4707) over Grable Creek is a concrete continuous culvert carrying Nfa 2422 (sa 4707) over Grable Creek in Knox County, Tennessee. It was built in 1930, so it is 95 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 2,428 vehicles a day, roughly 3% of them trucks, projected to reach 2,752 by 2040. The structure is 37 ft (11.3 m) long and 21 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNfa 2422 (sa 4707)
CrossesGrable Creek
LocationEverett Rd-Near Loudon CO
RouteCounty Highway 2422
CountyKnox County
StateTennessee
Coordinates35.88748, -84.24333
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length37 ft (11.3 m)
Longest span15 ft (4.6 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,428 (2021)
Projected traffic2,752 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 of existing bridge without deck rehabilitation
Estimated improvement cost$205,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 2422 (sa 4707) over Grable Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Nfa 2422 (sa 4707) over Grable 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 May 2024.

How much traffic does Nfa 2422 (sa 4707) over Grable Creek carry?

About 2,428 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 2422 (sa 4707) over Grable Creek?

The structure is 37 ft (11.3 m) long with a longest span of 15 ft (4.6 m) and a deck 21 ft wide.

Who owns Nfa 2422 (sa 4707) over Grable Creek?

It is owned by the County Highway Agency.