US Bridges

Nfa 1430 (sa 4523) over I81

FairPosted for load

Jefferson County, Tennessee · Just N of 140 JCT · Structure no. 45I00810001

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
326 ft
4 main spans
Daily traffic
1,066
2021 count
Owner
State
State Highway Agency

About this bridge

Nfa 1430 (sa 4523) over I81 is a steel continuous stringer/multi-beam or girder carrying Nfa 1430 (sa 4523) over I81 in Jefferson County, Tennessee. It was built in 1960, so it is 65 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. Its operating status is: posted for load restriction.

It carries about 1,066 vehicles a day, roughly 3% of them trucks, projected to reach 1,706 by 2042. The structure is 326 ft (99.5 m) long and 29 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesNfa 1430 (sa 4523)
CrossesI81
LocationJust N of 140 JCT
RouteCounty Highway 1430
CountyJefferson County
StateTennessee
Coordinates36.07826, -83.37217
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating17.2 US tons
Inventory rating13.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length326 ft (99.5 m)
Longest span101 ft (30.8 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,066 (2021)
Projected traffic1,706 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.8 mi (19 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa 1430 (sa 4523) over I81 built?

It was built in 1960, making it 65 years old in 2025.

What condition is Nfa 1430 (sa 4523) over I81 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 June 2024.

How much traffic does Nfa 1430 (sa 4523) over I81 carry?

About 1,066 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1430 (sa 4523) over I81?

The structure is 326 ft (99.5 m) long with a longest span of 101 ft (30.8 m) and a deck 29 ft wide.

Who owns Nfa 1430 (sa 4523) over I81?

It is owned by the State Highway Agency.