US Bridges

Nfa A423 over Robertson Branch

Fair

Sumner County, Tennessee · 3 MI NW JCT SR174&SR258 · Structure no. 830A4230009

Built
1965
60 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,350
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A423 over Robertson Branch is a concrete continuous culvert carrying Nfa A423 over Robertson Branch in Sumner County, Tennessee. It was built in 1965, so it is 60 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.

It carries about 1,350 vehicles a day, roughly 4% of them trucks, projected to reach 2,160 by 2041. The structure is 25 ft (7.6 m) long and 22 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNfa A423
CrossesRobertson Branch
Location3 MI NW JCT SR174&SR258
RouteCounty Highway 0A423
CountySumner County
StateTennessee
Coordinates36.41115, -86.63364
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length25 ft (7.6 m)
Longest span10 ft (3 m)
Deck width22 ft (6.8 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,350 (2020)
Projected traffic2,160 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$142,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A423 over Robertson Branch built?

It was built in 1965, making it 60 years old in 2025.

What condition is Nfa A423 over Robertson 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 January 2025.

How much traffic does Nfa A423 over Robertson Branch carry?

About 1,350 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Nfa A423 over Robertson Branch?

The structure is 25 ft (7.6 m) long with a longest span of 10 ft (3 m) and a deck 22 ft wide.

Who owns Nfa A423 over Robertson Branch?

It is owned by the County Highway Agency.