US Bridges

FAP 100 over Harpeth River

Poor

Davidson County, Tennessee · 1.4 M SW JCT SR100&SR254 · Structure no. 19SR1000013

Built
1929
96 years old
Condition
Poor
inspected April 2023
Type
Truss - Thru
Steel
Length
826 ft
1 main span
Daily traffic
19,517
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 100 over Harpeth River is a steel truss - thru carrying FAP 100 over 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.

It carries about 19,517 vehicles a day, roughly 9% of them trucks, projected to reach 33,032 by 2041. The structure is 826 ft (251.8 m) long and 42 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

Location

Open in Google Maps
CarriesFAP 100
CrossesHarpeth River
Location1.4 M SW JCT SR100&SR254
RouteState Highway 100
CountyDavidson County
StateTennessee
Coordinates36.05393, -86.92965
Functional classUrban Other Principal Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating35.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+24 approach)
Design loadH 15
Structure length826 ft (251.8 m)
Longest span140 ft (42.7 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic19,517 (2021)
Projected traffic33,032 by 2041
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$12.4 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 100 over Harpeth River built?

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

What condition is FAP 100 over 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 Harpeth River carry?

About 19,517 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is FAP 100 over Harpeth River?

The structure is 826 ft (251.8 m) long with a longest span of 140 ft (42.7 m) and a deck 42 ft wide.

Who owns FAP 100 over Harpeth River?

It is owned by the State Highway Agency.