US Bridges

Nfa A175 over Overflow

Fair

McNairy County, Tennessee · 3. MI N of Miss. · Structure no. 550A1750001

Built
1988
37 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
302 ft
5 main spans
Daily traffic
70
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A175 over Overflow is a prestressed concrete stringer/multi-beam or girder carrying Nfa A175 over Overflow in McNairy County, Tennessee. It was built in 1988, so it is 37 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 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 70 vehicles a day, roughly 2% of them trucks, projected to reach 112 by 2040. The structure is 302 ft (92 m) long and 25 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesNfa A175
CrossesOverflow
Location3. MI N of Miss.
RouteCounty Highway 175
Coordinates35.01833, -88.73211
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating34.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length302 ft (92 m)
Longest span61 ft (18.6 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2020)
Projected traffic112 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A175 over Overflow built?

It was built in 1988, making it 37 years old in 2025.

What condition is Nfa A175 over Overflow 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 August 2024.

How much traffic does Nfa A175 over Overflow carry?

About 70 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A175 over Overflow?

The structure is 302 ft (92 m) long with a longest span of 61 ft (18.6 m) and a deck 25 ft wide.

Who owns Nfa A175 over Overflow?

It is owned by the County Highway Agency.