US Bridges

Nfa A171 over SR 3

Good

Obion County, Tennessee · 0.2 MI N of SR214 · Structure no. 66SR0030053

Built
1978
47 years old
Condition
Good
inspected March 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
240 ft
2 main spans
Daily traffic
80
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A171 over SR 3 is a prestressed concrete continuous box beam or girders - single or spread carrying Nfa A171 over SR 3 in Obion County, Tennessee. It was built in 1978, so it is 47 years old, younger 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 80 vehicles a day, roughly 5% of them trucks, projected to reach 128 by 2041. The structure is 240 ft (73.2 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNfa A171
CrossesSR 3
Location0.2 MI N of SR214
RouteCounty Highway 171
Coordinates36.48214, -88.94097
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length240 ft (73.2 m)
Longest span120 ft (36.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2020)
Projected traffic128 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
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 A171 over SR 3 built?

It was built in 1978, making it 47 years old in 2025.

What condition is Nfa A171 over SR 3 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 March 2023.

How much traffic does Nfa A171 over SR 3 carry?

About 80 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Nfa A171 over SR 3?

The structure is 240 ft (73.2 m) long with a longest span of 120 ft (36.6 m) and a deck 32 ft wide.

Who owns Nfa A171 over SR 3?

It is owned by the State Highway Agency.