US Bridges

Nfa A480 over Sulphur Fork

Poor

Robertson County, Tennessee · In City of Springfield · Structure no. 740A4800001

Built
1960
65 years old
Condition
Poor
inspected May 2024
Type
Tee Beam
Concrete
Length
97 ft
3 main spans
Daily traffic
250
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A480 over Sulphur Fork is a concrete tee beam carrying Nfa A480 over Sulphur Fork in Robertson 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 250 vehicles a day, roughly 1% of them trucks, projected to reach 400 by 2042. The structure is 97 ft (29.6 m) long and 22 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesNfa A480
CrossesSulphur Fork
LocationIn City of Springfield
RouteCounty Highway 480
CountyRobertson County
StateTennessee
Coordinates36.51928, -86.91232
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length97 ft (29.6 m)
Longest span32 ft (9.8 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2020)
Projected traffic400 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A480 over Sulphur Fork built?

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

What condition is Nfa A480 over Sulphur Fork in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does Nfa A480 over Sulphur Fork carry?

About 250 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa A480 over Sulphur Fork?

The structure is 97 ft (29.6 m) long with a longest span of 32 ft (9.8 m) and a deck 22 ft wide.

Who owns Nfa A480 over Sulphur Fork?

It is owned by the County Highway Agency.