US Bridges

Nfa A670 over Little Richland Creek

Fair

Rhea County, Tennessee · 0.8 MI W of SR29 · Structure no. 720A1390001

Built
1977
48 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
2,310
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa A670 over Little Richland Creek is a prestressed concrete box beam or girders - multiple carrying Nfa A670 over Little Richland Creek in Rhea County, Tennessee. It was built in 1977, so it is 48 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 2,310 vehicles a day, roughly 3% of them trucks, projected to reach 3,696 by 2040. The structure is 67 ft (20.4 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNfa A670
CrossesLittle Richland Creek
Location0.8 MI W of SR29
RouteCity Street 670
Coordinates35.50324, -85.006
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span62 ft (18.9 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,310 (2020)
Projected traffic3,696 by 2040
Trucks3%
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

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 A670 over Little Richland Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is Nfa A670 over Little Richland 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 October 2024.

How much traffic does Nfa A670 over Little Richland Creek carry?

About 2,310 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Nfa A670 over Little Richland Creek?

The structure is 67 ft (20.4 m) long with a longest span of 62 ft (18.9 m) and a deck 36 ft wide.

Who owns Nfa A670 over Little Richland Creek?

It is owned by the City or Municipal Highway Agency.