US Bridges

Nfa A312 over Bednigo Branch

Good

Robertson County, Tennessee · 3.2 MI SE JCT SR65&SR257 · Structure no. 740A3120011

Built
1940
85 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
350
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A312 over Bednigo Branch is a prestressed concrete stringer/multi-beam or girder carrying Nfa A312 over Bednigo Branch in Robertson County, Tennessee. It was built in 1940, so it is 85 years old, older 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 350 vehicles a day, roughly 2% of them trucks, projected to reach 560 by 2042. The structure is 41 ft (12.5 m) long and 23 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesNfa A312
CrossesBednigo Branch
Location3.2 MI SE JCT SR65&SR257
RouteCounty Highway 0A312
Coordinates36.39618, -86.89705
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span38 ft (11.6 m)
Deck width23 ft (7 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2020)
Projected traffic560 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 A312 over Bednigo Branch built?

It was built in 1940, making it 85 years old in 2025.

What condition is Nfa A312 over Bednigo 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 2024.

How much traffic does Nfa A312 over Bednigo Branch carry?

About 350 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A312 over Bednigo Branch?

The structure is 41 ft (12.5 m) long with a longest span of 38 ft (11.6 m) and a deck 23 ft wide.

Who owns Nfa A312 over Bednigo Branch?

It is owned by the County Highway Agency.