US Bridges

Nfa 819 (sa 4915) over Knob Creek

FairPosted for load

Lauderdale County, Tennessee · N. of Ripley · Structure no. 49S80440013

Built
1953
72 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
100 ft
3 main spans
Daily traffic
514
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 819 (sa 4915) over Knob Creek is a concrete tee beam carrying Nfa 819 (sa 4915) over Knob Creek in Lauderdale County, Tennessee. It was built in 1953, so it is 72 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. Its operating status is: posted for load restriction.

It carries about 514 vehicles a day, roughly 3% of them trucks, projected to reach 822 by 2042. The structure is 100 ft (30.5 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa 819 (sa 4915)
CrossesKnob Creek
LocationN. of Ripley
RouteCounty Highway 819
CountyLauderdale County
StateTennessee
Coordinates35.8797, -89.53392
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.8 US tons
Inventory rating23.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length100 ft (30.5 m)
Longest span43 ft (13.1 m)
Deck width27 ft (8.1 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic514 (2021)
Projected traffic822 by 2042
Trucks3%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$238,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 819 (sa 4915) over Knob Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is Nfa 819 (sa 4915) over Knob Creek 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 2023.

How much traffic does Nfa 819 (sa 4915) over Knob Creek carry?

About 514 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 819 (sa 4915) over Knob Creek?

The structure is 100 ft (30.5 m) long with a longest span of 43 ft (13.1 m) and a deck 27 ft wide.

Who owns Nfa 819 (sa 4915) over Knob Creek?

It is owned by the County Highway Agency.