US Bridges

FAS 46 over Dobbins Branch

Fair

Williamson County, Tennessee · 4.5 M SW JCT SR46&SR96 · Structure no. 94S61480003

Built
1993
32 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
51 ft
3 main spans
Daily traffic
3,886
2021 count
Owner
State
State Highway Agency

About this bridge

FAS 46 over Dobbins Branch is a concrete continuous culvert carrying FAS 46 over Dobbins Branch in Williamson County, Tennessee. It was built in 1993, so it is 32 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 6 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 3,886 vehicles a day, roughly 6% of them trucks, projected to reach 6,218 by 2042. The structure is 51 ft (15.5 m) long and 44 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesFAS 46
CrossesDobbins Branch
Location4.5 M SW JCT SR46&SR96
RouteState Highway 46
CountyWilliamson County
StateTennessee
Coordinates35.89612, -86.99384
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span15 ft (4.6 m)
Deck width44 ft (13.3 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,886 (2021)
Projected traffic6,218 by 2042
Trucks6%
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

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 FAS 46 over Dobbins Branch built?

It was built in 1993, making it 32 years old in 2025.

What condition is FAS 46 over Dobbins Branch 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 November 2024.

How much traffic does FAS 46 over Dobbins Branch carry?

About 3,886 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is FAS 46 over Dobbins Branch?

The structure is 51 ft (15.5 m) long with a longest span of 15 ft (4.6 m) and a deck 44 ft wide.

Who owns FAS 46 over Dobbins Branch?

It is owned by the State Highway Agency.