US Bridges

Nfa 2420 (sa 4708) over Hickory Creek

Good

Knox County, Tennessee · Yarnell Rd-N of I40 · Structure no. 47024200001

Built
1966
59 years old
Condition
Good
inspected May 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
29 ft
1 main span
Daily traffic
1,114
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 2420 (sa 4708) over Hickory Creek is a concrete box beam or girders - multiple carrying Nfa 2420 (sa 4708) over Hickory Creek in Knox County, Tennessee. It was built in 1966, so it is 59 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,114 vehicles a day, roughly 3% of them trucks, projected to reach 2,062 by 2042. The structure is 29 ft (8.8 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNfa 2420 (sa 4708)
CrossesHickory Creek
LocationYarnell Rd-N of I40
RouteCounty Highway 2420
Coordinates35.89132, -84.22273
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than 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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length29 ft (8.8 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.4 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,114 (2021)
Projected traffic2,062 by 2042
Trucks3%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$121,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 2420 (sa 4708) over Hickory Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Nfa 2420 (sa 4708) over Hickory Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does Nfa 2420 (sa 4708) over Hickory Creek carry?

About 1,114 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 2420 (sa 4708) over Hickory Creek?

The structure is 29 ft (8.8 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns Nfa 2420 (sa 4708) over Hickory Creek?

It is owned by the County Highway Agency.