US Bridges

Nfa A552 (sa 5028) over Knob Creek

FairPosted for load

Lawrence County, Tennessee · 5.5 M. Sw. Lawrenceberg. · Structure no. 500A5520005

Built
1975
50 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
200 ft
4 main spans
Daily traffic
440
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A552 (sa 5028) over Knob Creek is a steel stringer/multi-beam or girder carrying Nfa A552 (sa 5028) over Knob Creek in Lawrence County, Tennessee. It was built in 1975, so it is 50 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 5 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 440 vehicles a day, roughly 2% of them trucks, projected to reach 704 by 2041. The structure is 200 ft (61 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNfa A552 (sa 5028)
CrossesKnob Creek
Location5.5 M. Sw. Lawrenceberg.
RouteCounty Highway 552
CountyLawrence County
StateTennessee
Coordinates35.21229, -87.48046
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length200 ft (61 m)
Longest span50 ft (15.3 m)
Deck width27 ft (8.1 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic440 (2020)
Projected traffic704 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$430,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A552 (sa 5028) over Knob Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Nfa A552 (sa 5028) 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 April 2023.

How much traffic does Nfa A552 (sa 5028) over Knob Creek carry?

About 440 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A552 (sa 5028) over Knob Creek?

The structure is 200 ft (61 m) long with a longest span of 50 ft (15.3 m) and a deck 27 ft wide.

Who owns Nfa A552 (sa 5028) over Knob Creek?

It is owned by the County Highway Agency.