US Bridges

Nfa A450 over US-412 (SR-20)

Fair

Crockett County, Tennessee · S. Cavalier Drive · Structure no. 17SR0200031

Built
1994
31 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
261 ft
2 main spans
Daily traffic
840
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A450 over US-412 (SR-20) is a prestressed concrete continuous stringer/multi-beam or girder carrying Nfa A450 over US-412 (SR-20) in Crockett County, Tennessee. It was built in 1994, so it is 31 years old, younger 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 5 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 840 vehicles a day, roughly 2% of them trucks, projected to reach 1,344 by 2042. The structure is 261 ft (79.6 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNfa A450
CrossesUS-412 (SR-20)
LocationS. Cavalier Drive
RouteCounty Highway 450
CountyCrockett County
StateTennessee
Coordinates35.77494, -89.1283
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.7 US tons
Inventory rating23.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length261 ft (79.6 m)
Longest span135 ft (41 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic840 (2020)
Projected traffic1,344 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

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$2.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa A450 over US-412 (SR-20) built?

It was built in 1994, making it 31 years old in 2025.

What condition is Nfa A450 over US-412 (SR-20) 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 April 2024.

How much traffic does Nfa A450 over US-412 (SR-20) carry?

About 840 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A450 over US-412 (SR-20)?

The structure is 261 ft (79.6 m) long with a longest span of 135 ft (41 m) and a deck 32 ft wide.

Who owns Nfa A450 over US-412 (SR-20)?

It is owned by the State Highway Agency.