US Bridges

Nfa A390 over Branch

Good

Williamson County, Tennessee · 3.5 MI NE JCT SR46&SR100 · Structure no. 940A3900003

Built
1960
65 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete
Length
36 ft
1 main span
Daily traffic
400
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A390 over Branch is a concrete culvert carrying Nfa A390 over Branch in Williamson County, Tennessee. It was built in 1960, so it is 65 years old, older 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 400 vehicles a day, roughly 2% of them trucks, projected to reach 640 by 2041. The structure is 36 ft (11 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa A390
CrossesBranch
Location3.5 MI NE JCT SR46&SR100
RouteCounty Highway 390
CountyWilliamson County
StateTennessee
Coordinates35.93329, -87.13545
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating50.7 US tons
Inventory rating29.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length36 ft (11 m)
Longest span18 ft (5.5 m)
Deck width20 ft (6.2 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2020)
Projected traffic640 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$149,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A390 over Branch built?

It was built in 1960, making it 65 years old in 2025.

What condition is Nfa A390 over Branch 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 June 2023.

How much traffic does Nfa A390 over Branch carry?

About 400 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A390 over Branch?

The structure is 36 ft (11 m) long with a longest span of 18 ft (5.5 m) and a deck 20 ft wide.

Who owns Nfa A390 over Branch?

It is owned by the County Highway Agency.