US Bridges

FAU 4241 over Knob Creek

Fair

Washington County, Tennessee · SW of I181-W of Johnson C · Structure no. 900A0560001

Built
1970
55 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
2,861
2021 count
Owner
County
County Highway Agency

About this bridge

FAU 4241 over Knob Creek is a steel stringer/multi-beam or girder carrying FAU 4241 over Knob Creek in Washington County, Tennessee. It was built in 1970, so it is 55 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 2,861 vehicles a day, roughly 4% of them trucks, projected to reach 4,578 by 2042. The structure is 40 ft (12.2 m) long and 21 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAU 4241
CrossesKnob Creek
LocationSW of I181-W of Johnson C
RouteCity Street 4241
CountyWashington County
StateTennessee
Coordinates36.3489, -82.4046
Functional classUrban Minor Arterial

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 protection7 GoodSome minor problems.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span35 ft (10.6 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,861 (2021)
Projected traffic4,578 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$299,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAU 4241 over Knob Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is FAU 4241 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 FAU 4241 over Knob Creek carry?

About 2,861 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is FAU 4241 over Knob Creek?

The structure is 40 ft (12.2 m) long with a longest span of 35 ft (10.6 m) and a deck 21 ft wide.

Who owns FAU 4241 over Knob Creek?

It is owned by the County Highway Agency.