US Bridges

Nfa A417 (sa 1101) over Rock Branch

Fair

Cheatham County, Tennessee · 2 MI NW of I40 · Structure no. 11S61520007

Built
1976
49 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
1,090
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A417 (sa 1101) over Rock Branch is a concrete continuous culvert carrying Nfa A417 (sa 1101) over Rock Branch in Cheatham County, Tennessee. It was built in 1976, so it is 49 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 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 1,090 vehicles a day, roughly 2% of them trucks, projected to reach 1,744 by 2040. The structure is 22 ft (6.7 m) long and 28 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesNfa A417 (sa 1101)
CrossesRock Branch
Location2 MI NW of I40
RouteCounty Highway 417
CountyCheatham County
StateTennessee
Coordinates36.09583, -87.15157
Functional classRural 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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,090 (2020)
Projected traffic1,744 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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$91,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A417 (sa 1101) over Rock Branch built?

It was built in 1976, making it 49 years old in 2025.

What condition is Nfa A417 (sa 1101) over Rock 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 August 2024.

How much traffic does Nfa A417 (sa 1101) over Rock Branch carry?

About 1,090 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A417 (sa 1101) over Rock Branch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 28 ft wide.

Who owns Nfa A417 (sa 1101) over Rock Branch?

It is owned by the County Highway Agency.