Structure 94019270001 · Williamson County, TN

Nfa 4748 (sa 9423) over West Harpeth River

Carries Nfa 4748 (sa 9423) over West Harpeth River, 2.2 Mi NE Jct Sr46&sr96.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure and Substructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT94 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 6/9

94 ft end to end, longest span 45 ft. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a tee-beam bridge.

Built195076 years old
Length94.2 ft28.7 m
Daily traffic2,592counted 2021
Last inspectedJuly 2023every 24 months

Location

StateTennessee
CountyWilliamson
Location2.2 Mi NE Jct Sr46&sr96
CarriesNfa 4748 (sa 9423)
CrossesWest Harpeth River
Coordinates35.96422, -86.91859

Physical Characteristics

MaterialConcrete
DesignTee Beam
Total Length94.2 ft (28.7 m)
Max Span44.9 ft (13.7 m)
Deck Width25.3 ft (7.7 m)
Deck Area221.0 sq m
Main Spans2
Year Built1950

Traffic

Avg Daily Traffic2,592 (2021)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number94019270001

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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