US Bridges

Nfa A074 over Tumbling Creek

PoorPosted for load

Polk County, Tennessee · 5.2 MI SW JCT SR40&SR68 · Structure no. 700A0740001

Built
1936
89 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
81 ft
3 main spans
Daily traffic
170
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A074 over Tumbling Creek is a steel continuous stringer/multi-beam or girder carrying Nfa A074 over Tumbling Creek in Polk County, Tennessee. It was built in 1936, so it is 89 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 170 vehicles a day, roughly 2% of them trucks, projected to reach 272 by 2042. The structure is 81 ft (24.7 m) long and 22 ft wide. If it were closed, the detour would be 23 mi (37 km).

CarriesNfa A074
CrossesTumbling Creek
Location5.2 MI SW JCT SR40&SR68
RouteCounty Highway 74
Coordinates35.00207, -84.46938
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating19.6 US tons
Inventory rating15 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length81 ft (24.7 m)
Longest span35 ft (10.7 m)
Deck width22 ft (6.6 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2020)
Projected traffic272 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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$265,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A074 over Tumbling Creek built?

It was built in 1936, making it 89 years old in 2025.

What condition is Nfa A074 over Tumbling Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does Nfa A074 over Tumbling Creek carry?

About 170 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A074 over Tumbling Creek?

The structure is 81 ft (24.7 m) long with a longest span of 35 ft (10.7 m) and a deck 22 ft wide.

Who owns Nfa A074 over Tumbling Creek?

It is owned by the County Highway Agency.