US Bridges

FAP 6 over West Harpeth River

FairPosted for load

Williamson County, Tennessee · .2 M SW JCT SR6&SR248 · Structure no. 94SR0060005

Built
1928
97 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Concrete
Length
129 ft
3 main spans
Daily traffic
20,189
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 6 over West Harpeth River is a concrete tee beam carrying FAP 6 over West Harpeth River in Williamson County, Tennessee. It was built in 1928, so it is 97 years old, older 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. Its operating status is: posted for load restriction.

It carries about 20,189 vehicles a day, roughly 7% of them trucks, projected to reach 32,302 by 2042. The structure is 129 ft (39.3 m) long and 33 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesFAP 6
CrossesWest Harpeth River
Location.2 M SW JCT SR6&SR248
RouteU.S. Route 31
CountyWilliamson County
StateTennessee
Coordinates35.82945, -86.88284
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.1 US tons
Inventory rating21.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length129 ft (39.3 m)
Longest span43 ft (13.1 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,189 (2021)
Projected traffic32,302 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 6 over West Harpeth River built?

It was built in 1928, making it 97 years old in 2025.

What condition is FAP 6 over West 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 February 2025.

How much traffic does FAP 6 over West Harpeth River carry?

About 20,189 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is FAP 6 over West Harpeth River?

The structure is 129 ft (39.3 m) long with a longest span of 43 ft (13.1 m) and a deck 33 ft wide.

Who owns FAP 6 over West Harpeth River?

It is owned by the State Highway Agency.