US Bridges

Nfa 1920 (sa 6006) over Duck River

Poor

Maury County, Tennessee · 4 M. W. Williamsport. · Structure no. 60019200011

Built
1960
65 years old, rebuilt 1983
Condition
Poor
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
309 ft
4 main spans
Daily traffic
199
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1920 (sa 6006) over Duck River is a steel continuous stringer/multi-beam or girder carrying Nfa 1920 (sa 6006) over Duck River in Maury County, Tennessee. It was built in 1960 and reconstructed in 1983, 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 199 vehicles a day, roughly 3% of them trucks, projected to reach 318 by 2042. The structure is 309 ft (94.2 m) long and 26 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

CarriesNfa 1920 (sa 6006)
CrossesDuck River
Location4 M. W. Williamsport.
RouteCounty Highway 1920
Coordinates35.67653, -87.2895
Functional classRural Minor Collector

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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4 (+2 approach)
Design loadHS 20
Structure length309 ft (94.2 m)
Longest span69 ft (21 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic199 (2021)
Projected traffic318 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1920 (sa 6006) over Duck River built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1983.

What condition is Nfa 1920 (sa 6006) over Duck River 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 June 2024.

How much traffic does Nfa 1920 (sa 6006) over Duck River carry?

About 199 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1920 (sa 6006) over Duck River?

The structure is 309 ft (94.2 m) long with a longest span of 69 ft (21 m) and a deck 26 ft wide.

Who owns Nfa 1920 (sa 6006) over Duck River?

It is owned by the County Highway Agency.