US Bridges

Nfa A330 over Porter Road / I-840

Good

Dickson County, Tennessee · Porter RD @ I840 · Structure no. 22SR8400003

Built
2004
21 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
318 ft
2 main spans
Daily traffic
70
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A330 over Porter Road / I-840 is a prestressed concrete continuous stringer/multi-beam or girder carrying Nfa A330 over Porter Road / I-840 in Dickson 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 70 vehicles a day, roughly 16% of them trucks, projected to reach 112 by 2042. The structure is 318 ft (96.9 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa A330
CrossesPorter Road / I-840
LocationPorter RD @ I840
RouteCounty Highway 330
CountyDickson County
StateTennessee
Coordinates36.00146, -87.2522
Functional classRural Local

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.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length318 ft (96.9 m)
Longest span156 ft (47.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2020)
Projected traffic112 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa A330 over Porter Road / I-840 built?

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

What condition is Nfa A330 over Porter Road / I-840 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 May 2024.

How much traffic does Nfa A330 over Porter Road / I-840 carry?

About 70 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is Nfa A330 over Porter Road / I-840?

The structure is 318 ft (96.9 m) long with a longest span of 156 ft (47.6 m) and a deck 32 ft wide.

Who owns Nfa A330 over Porter Road / I-840?

It is owned by the State Highway Agency.