US Bridges

FAP 10 over Darwin Branch

Fair

Trousdale County, Tennessee · In Hartsville · Structure no. 85SR0100017

Built
1952
73 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete
Length
32 ft
1 main span
Daily traffic
9,196
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 10 over Darwin Branch is a concrete culvert carrying FAP 10 over Darwin Branch in Trousdale County, Tennessee. It was built in 1952, so it is 73 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 9,196 vehicles a day, roughly 6% of them trucks, projected to reach 11,891 by 2041. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 34.8 mi (56 km).

Location

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CarriesFAP 10
CrossesDarwin Branch
LocationIn Hartsville
RouteState Highway 10
CountyTrousdale County
StateTennessee
Coordinates36.39556, -86.15591
Functional classRural Minor Arterial

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 inspectionFebruary 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,196 (2021)
Projected traffic11,891 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$349,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 10 over Darwin Branch built?

It was built in 1952, making it 73 years old in 2025.

What condition is FAP 10 over Darwin 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 February 2023.

How much traffic does FAP 10 over Darwin Branch carry?

About 9,196 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is FAP 10 over Darwin Branch?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m).

Who owns FAP 10 over Darwin Branch?

It is owned by the State Highway Agency.