US Bridges

Nfa 1070 (sa 8503) over Stone Branch

Good

Trousdale County, Tennessee · 2 MI W of Smith Co. · Structure no. 85F00070003

Built
1986
39 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete Continuous
Length
37 ft
2 main spans
Daily traffic
246
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1070 (sa 8503) over Stone Branch is a concrete continuous culvert carrying Nfa 1070 (sa 8503) over Stone Branch in Trousdale County, Tennessee. It was built in 1986, so it is 39 years old, younger 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 246 vehicles a day, roughly 3% of them trucks, projected to reach 384 by 2041. The structure is 37 ft (11.3 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa 1070 (sa 8503)
CrossesStone Branch
Location2 MI W of Smith Co.
RouteCounty Highway 1070
CountyTrousdale County
StateTennessee
Coordinates36.33064, -86.13203
Functional classRural Minor 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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span12 ft (3.7 m)
Deck width26 ft (7.8 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic246 (2021)
Projected traffic384 by 2041
Trucks3%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1070 (sa 8503) over Stone Branch built?

It was built in 1986, making it 39 years old in 2025.

What condition is Nfa 1070 (sa 8503) over Stone 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 February 2023.

How much traffic does Nfa 1070 (sa 8503) over Stone Branch carry?

About 246 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1070 (sa 8503) over Stone Branch?

The structure is 37 ft (11.3 m) long with a longest span of 12 ft (3.7 m) and a deck 26 ft wide.

Who owns Nfa 1070 (sa 8503) over Stone Branch?

It is owned by the County Highway Agency.