US Bridges

Nfa 1248 (sa 4740) over Watt Road / I40

Fair

Knox County, Tennessee · On the Knox-Loudon CO LN · Structure no. 47I00400001

Built
1965
60 years old, rebuilt 1976
Condition
Fair
inspected October 2024
Type
Tee Beam
Concrete Continuous
Length
260 ft
4 main spans
Daily traffic
11,502
2021 count
Owner
State
State Highway Agency

About this bridge

Nfa 1248 (sa 4740) over Watt Road / I40 is a concrete continuous tee beam carrying Nfa 1248 (sa 4740) over Watt Road / I40 in Knox County, Tennessee. It was built in 1965 and reconstructed in 1976, 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 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 11,502 vehicles a day, roughly 6% of them trucks, projected to reach 17,840 by 2041. The structure is 260 ft (79.2 m) long and 50 ft wide.

Location

Open in Google Maps
CarriesNfa 1248 (sa 4740)
CrossesWatt Road / I40
LocationOn the Knox-Loudon CO LN
RouteCounty Highway 1248
CountyKnox County
StateTennessee
Coordinates35.87788, -84.23728
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 rating63.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length260 ft (79.2 m)
Longest span76 ft (23.2 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,502 (2021)
Projected traffic17,840 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 1248 (sa 4740) over Watt Road / I40 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1976.

What condition is Nfa 1248 (sa 4740) over Watt Road / I40 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 October 2024.

How much traffic does Nfa 1248 (sa 4740) over Watt Road / I40 carry?

About 11,502 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is Nfa 1248 (sa 4740) over Watt Road / I40?

The structure is 260 ft (79.2 m) long with a longest span of 76 ft (23.2 m) and a deck 50 ft wide.

Who owns Nfa 1248 (sa 4740) over Watt Road / I40?

It is owned by the State Highway Agency.