US Bridges

I 840 over I840 / West Harpeth Rv

Good

Williamson County, Tennessee · 0.8 MI W JCT I840 · Structure no. 94SR8400052

Built
2004
21 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
370 ft
3 main spans
Daily traffic
30,377
2021 count
Owner
State
State Highway Agency

About this bridge

I 840 over I840 / West Harpeth Rv is a prestressed concrete continuous stringer/multi-beam or girder carrying I 840 over I840 / West Harpeth Rv in Williamson County, Tennessee. It was built in 2004, so it is 21 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30,377 vehicles a day, roughly 7% of them trucks, projected to reach 41,246 by 2041. The structure is 370 ft (112.8 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesI 840
CrossesI840 / West Harpeth Rv
Location0.8 MI W JCT I840
RouteInterstate 840
CountyWilliamson County
StateTennessee
Coordinates35.82145, -86.86602
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length370 ft (112.8 m)
Longest span124 ft (37.8 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,377 (2021)
Projected traffic41,246 by 2041
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 840 over I840 / West Harpeth Rv built?

It was built in 2004, making it 21 years old in 2025.

What condition is I 840 over I840 / West Harpeth Rv in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does I 840 over I840 / West Harpeth Rv carry?

About 30,377 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I 840 over I840 / West Harpeth Rv?

The structure is 370 ft (112.8 m) long with a longest span of 124 ft (37.8 m) and a deck 44 ft wide.

Who owns I 840 over I840 / West Harpeth Rv?

It is owned by the State Highway Agency.