US Bridges

Nfa A256 over Mill Branch

Fair

Robertson County, Tennessee · 1.6 MI S JCT I65&SR76 · Structure no. 740A2580001

Built
2004
21 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
550
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A256 over Mill Branch is a concrete continuous culvert carrying Nfa A256 over Mill Branch in Robertson County, Tennessee. It was built in 2004, so it is 21 years old, younger 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 6 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 550 vehicles a day, roughly 2% of them trucks, projected to reach 880 by 2042. The structure is 31 ft (9.6 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesNfa A256
CrossesMill Branch
Location1.6 MI S JCT I65&SR76
RouteCounty Highway 258
CountyRobertson County
StateTennessee
Coordinates36.448, -86.688
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length31 ft (9.6 m)
Longest span10 ft (3 m)
Deck width30 ft (9 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2020)
Projected traffic880 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 A256 over Mill Branch built?

It was built in 2004, making it 21 years old in 2025.

What condition is Nfa A256 over Mill 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 April 2024.

How much traffic does Nfa A256 over Mill Branch carry?

About 550 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A256 over Mill Branch?

The structure is 31 ft (9.6 m) long with a longest span of 10 ft (3 m) and a deck 30 ft wide.

Who owns Nfa A256 over Mill Branch?

It is owned by the County Highway Agency.