US Bridges

Nfa A121 over Branch

Good

Rhea County, Tennessee · 1 MI East of Dayton · Structure no. 720A1210001

Built
1993
32 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
600
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A121 over Branch is a concrete continuous culvert carrying Nfa A121 over Branch in Rhea County, Tennessee. It was built in 1993, so it is 32 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 600 vehicles a day, roughly 4% of them trucks, projected to reach 960 by 2040. The structure is 27 ft (8.1 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNfa A121
CrossesBranch
Location1 MI East of Dayton
RouteCounty Highway 121
Coordinates35.50376, -85.02444
Functional classUrban Local

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 inspectionOctober 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable 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 length27 ft (8.1 m)
Longest span12 ft (3.7 m)
Deck width32 ft (9.7 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2020)
Projected traffic960 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 A121 over Branch built?

It was built in 1993, making it 32 years old in 2025.

What condition is Nfa A121 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 October 2024.

How much traffic does Nfa A121 over Branch carry?

About 600 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Nfa A121 over Branch?

The structure is 27 ft (8.1 m) long with a longest span of 12 ft (3.7 m) and a deck 32 ft wide.

Who owns Nfa A121 over Branch?

It is owned by the County Highway Agency.