US Bridges

Nfa 1021 (sa 7416) over Mill Branch

Fair

Robertson County, Tennessee · 2.2 MI N JCT I65&SR257 · Structure no. 74S62820001

Built
1959
66 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
114 ft
4 main spans
Daily traffic
1,664
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1021 (sa 7416) over Mill Branch is a concrete tee beam carrying Nfa 1021 (sa 7416) over Mill Branch in Robertson County, Tennessee. It was built in 1959, so it is 66 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 1,664 vehicles a day, roughly 5% of them trucks, projected to reach 2,288 by 2040. The structure is 114 ft (34.7 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1021 (sa 7416)
CrossesMill Branch
Location2.2 MI N JCT I65&SR257
RouteCounty Highway 1021
CountyRobertson County
StateTennessee
Coordinates36.44736, -86.71458
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length114 ft (34.7 m)
Longest span28 ft (8.5 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,664 (2021)
Projected traffic2,288 by 2040
Trucks5%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$346,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1021 (sa 7416) over Mill Branch built?

It was built in 1959, making it 66 years old in 2025.

What condition is Nfa 1021 (sa 7416) 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 1021 (sa 7416) over Mill Branch carry?

About 1,664 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Nfa 1021 (sa 7416) over Mill Branch?

The structure is 114 ft (34.7 m) long with a longest span of 28 ft (8.5 m) and a deck 28 ft wide.

Who owns Nfa 1021 (sa 7416) over Mill Branch?

It is owned by the County Highway Agency.