US Bridges

Nfa A484 over West Fork of Spring CR

Fair

Williamson County, Tennessee · 0.5 MI N JCT SR11&MARSHAL · Structure no. 940A4840001

Built
1950
75 years old, rebuilt 1970
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
41 ft
2 main spans
Daily traffic
220
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A484 over West Fork of Spring CR is a concrete continuous culvert carrying Nfa A484 over West Fork of Spring CR in Williamson County, Tennessee. It was built in 1950 and reconstructed in 1970, so it is 75 years old, older 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 220 vehicles a day, roughly 2% of them trucks, projected to reach 352 by 2041. The structure is 41 ft (12.5 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesNfa A484
CrossesWest Fork of Spring CR
Location0.5 MI N JCT SR11&MARSHAL
RouteCounty Highway 484
CountyWilliamson County
StateTennessee
Coordinates35.71323, -86.6974
Functional classRural Local

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
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 alignment8: Equal to present desirable criteria
Operating rating49.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length41 ft (12.5 m)
Longest span18 ft (5.5 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic220 (2020)
Projected traffic352 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 A484 over West Fork of Spring CR built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1970.

What condition is Nfa A484 over West Fork of Spring CR 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 April 2023.

How much traffic does Nfa A484 over West Fork of Spring CR carry?

About 220 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A484 over West Fork of Spring CR?

The structure is 41 ft (12.5 m) long with a longest span of 18 ft (5.5 m) and a deck 29 ft wide.

Who owns Nfa A484 over West Fork of Spring CR?

It is owned by the County Highway Agency.