US Bridges

Nfa 1256 (sa 4716) over Branch

Good

Knox County, Tennessee · Heiskell Rd-Just S of 170 · Structure no. 47S24100013

Built
1955
70 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
32 ft
2 main spans
Daily traffic
2,311
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1256 (sa 4716) over Branch is a concrete continuous culvert carrying Nfa 1256 (sa 4716) over Branch in Knox County, Tennessee. It was built in 1955, so it is 70 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,311 vehicles a day, roughly 5% of them trucks, projected to reach 3,584 by 2040. The structure is 32 ft (9.8 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1256 (sa 4716)
CrossesBranch
LocationHeiskell Rd-Just S of 170
RouteCounty Highway 1256
CountyKnox County
StateTennessee
Coordinates36.07865, -84.05138
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 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 rating46.7 US tons
Inventory rating28.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length32 ft (9.8 m)
Longest span14 ft (4.3 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6 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$227,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1955, making it 70 years old in 2025.

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

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does Nfa 1256 (sa 4716) over Branch carry?

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

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

The structure is 32 ft (9.8 m) long with a longest span of 14 ft (4.3 m) and a deck 22 ft wide.

Who owns Nfa 1256 (sa 4716) over Branch?

It is owned by the County Highway Agency.