US Bridges

Nfa 1256 (sa 4716) over Childress Branch

FairPosted for load

Knox County, Tennessee · Heiskell Rd-S of SR170 · Structure no. 47S24100011

Built
1951
74 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
159 ft
3 main spans
Daily traffic
2,311
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1256 (sa 4716) over Childress Branch is a steel continuous stringer/multi-beam or girder carrying Nfa 1256 (sa 4716) over Childress Branch in Knox County, Tennessee. It was built in 1951, so it is 74 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 2,311 vehicles a day, roughly 5% of them trucks, projected to reach 3,584 by 2040. The structure is 159 ft (48.5 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1256 (sa 4716)
CrossesChildress Branch
LocationHeiskell Rd-S of SR170
RouteCounty Highway 1256
CountyKnox County
StateTennessee
Coordinates36.06924, -84.0469
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length159 ft (48.5 m)
Longest span59 ft (18 m)
Deck width27 ft (8.1 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,311 (2021)
Projected traffic3,584 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$814,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1256 (sa 4716) over Childress Branch built?

It was built in 1951, making it 74 years old in 2025.

What condition is Nfa 1256 (sa 4716) over Childress Branch 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 1256 (sa 4716) over Childress Branch carry?

About 2,311 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Nfa 1256 (sa 4716) over Childress Branch?

The structure is 159 ft (48.5 m) long with a longest span of 59 ft (18 m) and a deck 27 ft wide.

Who owns Nfa 1256 (sa 4716) over Childress Branch?

It is owned by the County Highway Agency.