US Bridges

Nfa A180 over Harpeth River

Good

Williamson County, Tennessee · 3.1 MI SW JCT SR96&SR252 · Structure no. 940A1800003

Built
2019
6 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
530
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A180 over Harpeth River is a prestressed concrete box beam or girders - multiple carrying Nfa A180 over Harpeth River in Williamson County, Tennessee. It was built in 2019, so it is 6 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 530 vehicles a day, roughly 2% of them trucks, projected to reach 848 by 2041. The structure is 110 ft (33.5 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNfa A180
CrossesHarpeth River
Location3.1 MI SW JCT SR96&SR252
RouteCounty Highway 180
CountyWilliamson County
StateTennessee
Coordinates35.86217, -86.76324
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length110 ft (33.5 m)
Longest span96 ft (29.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic530 (2020)
Projected traffic848 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 A180 over Harpeth River built?

It was built in 2019, making it 6 years old in 2025.

What condition is Nfa A180 over Harpeth River 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 April 2023.

How much traffic does Nfa A180 over Harpeth River carry?

About 530 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A180 over Harpeth River?

The structure is 110 ft (33.5 m) long with a longest span of 96 ft (29.2 m) and a deck 31 ft wide.

Who owns Nfa A180 over Harpeth River?

It is owned by the County Highway Agency.