US Bridges

FAP 100 over South Harpeth River

PoorPosted for load

Davidson County, Tennessee · .3 M NE JCT SR96&SR100 · Structure no. 19SR1000001

Built
1929
96 years old
Condition
Poor
inspected April 2023
Type
Truss - Thru
Steel
Length
654 ft
1 main span
Daily traffic
12,484
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 100 over South Harpeth River is a steel truss - thru carrying FAP 100 over South Harpeth River in Davidson County, Tennessee. It was built in 1929, so it is 96 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 12,484 vehicles a day, roughly 9% of them trucks, projected to reach 19,974 by 2042. The structure is 654 ft (199.3 m) long and 44 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

Location

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CarriesFAP 100
CrossesSouth Harpeth River
Location.3 M NE JCT SR96&SR100
RouteState Highway 100
CountyDavidson County
StateTennessee
Coordinates36.01833, -87.03
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.1 US tons
Inventory rating20.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+20 approach)
Design loadH 15
Structure length654 ft (199.3 m)
Longest span100 ft (30.5 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic12,484 (2021)
Projected traffic19,974 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 km)
TollOn a free road
National Highway SystemYes

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$6.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 100 over South Harpeth River built?

It was built in 1929, making it 96 years old in 2025.

What condition is FAP 100 over South Harpeth River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does FAP 100 over South Harpeth River carry?

About 12,484 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is FAP 100 over South Harpeth River?

The structure is 654 ft (199.3 m) long with a longest span of 100 ft (30.5 m) and a deck 44 ft wide.

Who owns FAP 100 over South Harpeth River?

It is owned by the State Highway Agency.