US Bridges

Nfa 1007 (sa 9430) over Harpeth River

Fair

Williamson County, Tennessee · 1.8 MI NW JCT SR6&SR253 · Structure no. 94010070001

Built
1950
75 years old, rebuilt 1991
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
65 ft
2 main spans
Daily traffic
7,780
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa 1007 (sa 9430) over Harpeth River is a concrete slab carrying Nfa 1007 (sa 9430) over Harpeth River in Williamson County, Tennessee. It was built in 1950 and reconstructed in 1991, so it is 75 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.

It carries about 7,780 vehicles a day, roughly 4% of them trucks, projected to reach 16,136 by 2042. The structure is 65 ft (19.8 m) long and 50 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1007 (sa 9430)
CrossesHarpeth River
Location1.8 MI NW JCT SR6&SR253
RouteCity Street 1007
CountyWilliamson County
StateTennessee
Coordinates36.02476, -86.81902
Functional classUrban Minor 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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span30 ft (9.1 m)
Deck width50 ft (15.2 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,780 (2021)
Projected traffic16,136 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 1007 (sa 9430) over Harpeth River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1991.

What condition is Nfa 1007 (sa 9430) 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 July 2023.

How much traffic does Nfa 1007 (sa 9430) over Harpeth River carry?

About 7,780 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Nfa 1007 (sa 9430) over Harpeth River?

The structure is 65 ft (19.8 m) long with a longest span of 30 ft (9.1 m) and a deck 50 ft wide.

Who owns Nfa 1007 (sa 9430) over Harpeth River?

It is owned by the City or Municipal Highway Agency.