US Bridges

FAP 397 over Harpeth River

Fair

Williamson County, Tennessee · 1.3 MI NW JCT SR6&SR96 · Structure no. 94SR3970015

Built
1989
36 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
276 ft
4 main spans
Daily traffic
19,868
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 397 over Harpeth River is a prestressed concrete box beam or girders - single or spread carrying FAP 397 over Harpeth River in Williamson County, Tennessee. It was built in 1989, so it is 36 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 19,868 vehicles a day, roughly 9% of them trucks, projected to reach 25,629 by 2041. The structure is 276 ft (84.1 m) long and 44 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFAP 397
CrossesHarpeth River
Location1.3 MI NW JCT SR6&SR96
RouteState Highway 397
CountyWilliamson County
StateTennessee
Coordinates35.94641, -86.8708
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length276 ft (84.1 m)
Longest span69 ft (21 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,868 (2021)
Projected traffic25,629 by 2041
Trucks9%
Lanes on structure2
Traffic directionOne-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 1989, making it 36 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 19,868 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is FAP 397 over Harpeth River?

The structure is 276 ft (84.1 m) long with a longest span of 69 ft (21 m) and a deck 44 ft wide.

Who owns FAP 397 over Harpeth River?

It is owned by the State Highway Agency.