US Bridges

FAP 397 over Harpeth River

Fair

Williamson County, Tennessee · 2.9 MI N JCT SR106&SR248 · Structure no. 94SR3970003

Built
1986
39 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
189 ft
3 main spans
Daily traffic
20,234
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 397 over Harpeth River is a prestressed concrete stringer/multi-beam or girder carrying FAP 397 over Harpeth River in Williamson County, Tennessee. It was built in 1986, so it is 39 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 20,234 vehicles a day, roughly 9% of them trucks, projected to reach 32,779 by 2041. The structure is 189 ft (57.6 m) long and 50 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesFAP 397
CrossesHarpeth River
Location2.9 MI N JCT SR106&SR248
RouteState Highway 397
Coordinates35.90048, -86.84644
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length189 ft (57.6 m)
Longest span80 ft (24.4 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,234 (2021)
Projected traffic32,779 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 397 over Harpeth River built?

It was built in 1986, making it 39 years old in 2025.

What condition is FAP 397 over Harpeth River 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 March 2023.

How much traffic does FAP 397 over Harpeth River carry?

About 20,234 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is FAP 397 over Harpeth River?

The structure is 189 ft (57.6 m) long with a longest span of 80 ft (24.4 m) and a deck 50 ft wide.

Who owns FAP 397 over Harpeth River?

It is owned by the State Highway Agency.