US Bridges

Nfa 1224 (sa 7315) over I40

PoorPosted for load

Roane County, Tennessee · E of Kingston- W of SR 58 · Structure no. 73I00400019

Built
1969
56 years old
Condition
Poor
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
214 ft
4 main spans
Daily traffic
1,788
2021 count
Owner
State
State Highway Agency

About this bridge

Nfa 1224 (sa 7315) over I40 is a concrete continuous tee beam carrying Nfa 1224 (sa 7315) over I40 in Roane County, Tennessee. It was built in 1969, so it is 56 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 1,788 vehicles a day, roughly 1% of them trucks, projected to reach 2,613 by 2042. The structure is 214 ft (65.2 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNfa 1224 (sa 7315)
CrossesI40
LocationE of Kingston- W of SR 58
RouteCounty Highway 1224
CountyRoane County
StateTennessee
Coordinates35.873, -84.46201
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length214 ft (65.2 m)
Longest span73 ft (22.3 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,788 (2021)
Projected traffic2,613 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa 1224 (sa 7315) over I40 built?

It was built in 1969, making it 56 years old in 2025.

What condition is Nfa 1224 (sa 7315) over I40 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Nfa 1224 (sa 7315) over I40 carry?

About 1,788 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Nfa 1224 (sa 7315) over I40?

The structure is 214 ft (65.2 m) long with a longest span of 73 ft (22.3 m) and a deck 34 ft wide.

Who owns Nfa 1224 (sa 7315) over I40?

It is owned by the State Highway Agency.