US Bridges

Nfa B662 over Knob Creek

Fair

Washington County, Tennessee · SW of I181&OAKLAND Av Ex · Structure no. 900B6620001

Built
1980
45 years old
Condition
Fair
inspected June 2024
Type
Culvert
Steel
Length
38 ft
2 main spans
Daily traffic
4,920
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa B662 over Knob Creek is a steel culvert carrying Nfa B662 over Knob Creek in Washington County, Tennessee. It was built in 1980, so it is 45 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 4,920 vehicles a day, roughly 2% of them trucks, projected to reach 7,872 by 2042. The structure is 38 ft (11.6 m) long and 46 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa B662
CrossesKnob Creek
LocationSW of I181&OAKLAND Av Ex
RouteCity Street 662
CountyWashington County
StateTennessee
Coordinates36.35093, -82.40263
Functional classUrban 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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length38 ft (11.6 m)
Longest span14 ft (4.4 m)
Deck width46 ft (13.9 m)
Roadway width46 ft (13.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,920 (2020)
Projected traffic7,872 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 B662 over Knob Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Nfa B662 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 June 2024.

How much traffic does Nfa B662 over Knob Creek carry?

About 4,920 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa B662 over Knob Creek?

The structure is 38 ft (11.6 m) long with a longest span of 14 ft (4.4 m) and a deck 46 ft wide.

Who owns Nfa B662 over Knob Creek?

It is owned by the City or Municipal Highway Agency.