US Bridges

Nfa 1074 (sa 8508) over Dog Branch

Good

Trousdale County, Tennessee · 2 MI W of Smith Co. · Structure no. 85S62900005

Built
1992
33 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
35 ft
1 main span
Daily traffic
319
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1074 (sa 8508) over Dog Branch is a concrete culvert carrying Nfa 1074 (sa 8508) over Dog Branch in Trousdale County, Tennessee. It was built in 1992, so it is 33 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 319 vehicles a day, roughly 4% of them trucks, projected to reach 528 by 2041. The structure is 35 ft (10.7 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa 1074 (sa 8508)
CrossesDog Branch
Location2 MI W of Smith Co.
RouteCounty Highway 1074
CountyTrousdale County
StateTennessee
Coordinates36.39724, -86.03421
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span34 ft (10.4 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic319 (2021)
Projected traffic528 by 2041
Trucks4%
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 1074 (sa 8508) over Dog Branch built?

It was built in 1992, making it 33 years old in 2025.

What condition is Nfa 1074 (sa 8508) over Dog 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 March 2023.

How much traffic does Nfa 1074 (sa 8508) over Dog Branch carry?

About 319 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Nfa 1074 (sa 8508) over Dog Branch?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 29 ft wide.

Who owns Nfa 1074 (sa 8508) over Dog Branch?

It is owned by the County Highway Agency.