US Bridges

Nfa 842 (sa 9408) over Cove Branch

Fair

Williamson County, Tennessee · 4.4 MI SW JCT SR11&SR16 · Structure no. 94S61830003

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
37 ft
2 main spans
Daily traffic
2,309
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 842 (sa 9408) over Cove Branch is a concrete continuous culvert carrying Nfa 842 (sa 9408) over Cove Branch in Williamson County, Tennessee. It was built in 1960, so it is 65 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 2,309 vehicles a day, roughly 3% of them trucks, projected to reach 4,544 by 2041. The structure is 37 ft (11.3 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa 842 (sa 9408)
CrossesCove Branch
Location4.4 MI SW JCT SR11&SR16
RouteCounty Highway 842
CountyWilliamson County
StateTennessee
Coordinates35.75286, -86.70226
Functional classRural Minor 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
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 inspectionApril 2023
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length37 ft (11.3 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,309 (2021)
Projected traffic4,544 by 2041
Trucks3%
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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$71,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 842 (sa 9408) over Cove Branch built?

It was built in 1960, making it 65 years old in 2025.

What condition is Nfa 842 (sa 9408) over Cove 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 2023.

How much traffic does Nfa 842 (sa 9408) over Cove Branch carry?

About 2,309 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 842 (sa 9408) over Cove Branch?

The structure is 37 ft (11.3 m) long with a longest span of 15 ft (4.6 m).

Who owns Nfa 842 (sa 9408) over Cove Branch?

It is owned by the County Highway Agency.