US Bridges

Nfa 1931 (sa 1102) over Harpeth River

Fair

Cheatham County, Tennessee · 1.5 M. S. US70. · Structure no. 11019310001

Built
1985
40 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
344 ft
4 main spans
Daily traffic
659
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa 1931 (sa 1102) over Harpeth River is a prestressed concrete continuous box beam or girders - single or spread carrying Nfa 1931 (sa 1102) over Harpeth River in Cheatham County, Tennessee. It was built in 1985, so it is 40 years old, younger 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 659 vehicles a day, roughly 3% of them trucks, projected to reach 1,152 by 2040. The structure is 344 ft (104.9 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNfa 1931 (sa 1102)
CrossesHarpeth River
Location1.5 M. S. US70.
RouteCounty Highway 1931
CountyCheatham County
StateTennessee
Coordinates36.10145, -87.10795
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being 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 rating61.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length344 ft (104.9 m)
Longest span86 ft (26.2 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic659 (2021)
Projected traffic1,152 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1931 (sa 1102) over Harpeth River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Nfa 1931 (sa 1102) over Harpeth River 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 1931 (sa 1102) over Harpeth River carry?

About 659 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1931 (sa 1102) over Harpeth River?

The structure is 344 ft (104.9 m) long with a longest span of 86 ft (26.2 m) and a deck 28 ft wide.

Who owns Nfa 1931 (sa 1102) over Harpeth River?

It is owned by the City or Municipal Highway Agency.