US Bridges

Nfa A235 over Harpeth River

Fair

Williamson County, Tennessee · 1.7 MI SW JCT SR96&SR252 · Structure no. 940A2350001

Built
1984
41 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
260 ft
4 main spans
Daily traffic
500
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A235 over Harpeth River is a prestressed concrete box beam or girders - single or spread carrying Nfa A235 over Harpeth River in Williamson County, Tennessee. It was built in 1984, so it is 41 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 5 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 500 vehicles a day, roughly 2% of them trucks, projected to reach 800 by 2041. The structure is 260 ft (79.2 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNfa A235
CrossesHarpeth River
Location1.7 MI SW JCT SR96&SR252
RouteCounty Highway 235
CountyWilliamson County
StateTennessee
Coordinates35.85173, -86.73437
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 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 length260 ft (79.2 m)
Longest span70 ft (21.3 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2020)
Projected traffic800 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 A235 over Harpeth River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nfa A235 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 April 2023.

How much traffic does Nfa A235 over Harpeth River carry?

About 500 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A235 over Harpeth River?

The structure is 260 ft (79.2 m) long with a longest span of 70 ft (21.3 m) and a deck 26 ft wide.

Who owns Nfa A235 over Harpeth River?

It is owned by the County Highway Agency.