US Bridges

Nfa A168 over Williams Branch

Good

Dickson County, Tennessee · 1.2 M. Se. SR 49. · Structure no. 220A2280003

Built
1960
65 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
39 ft
2 main spans
Daily traffic
250
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A168 over Williams Branch is a concrete continuous culvert carrying Nfa A168 over Williams Branch in Dickson 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 250 vehicles a day, roughly 2% of them trucks, projected to reach 400 by 2040. The structure is 39 ft (11.9 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa A168
CrossesWilliams Branch
Location1.2 M. Se. SR 49.
RouteCounty Highway 168
CountyDickson County
StateTennessee
Coordinates36.17933, -87.2795
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
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 alignment6: Equal to present minimum criteria
Operating rating42.5 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length39 ft (11.9 m)
Longest span11 ft (3.4 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2020)
Projected traffic400 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 A168 over Williams Branch built?

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

What condition is Nfa A168 over Williams 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 2024.

How much traffic does Nfa A168 over Williams Branch carry?

About 250 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A168 over Williams Branch?

The structure is 39 ft (11.9 m) long with a longest span of 11 ft (3.4 m) and a deck 26 ft wide.

Who owns Nfa A168 over Williams Branch?

It is owned by the County Highway Agency.