Structure 43SR0010031 · Humphreys County, TN

Nfa A423 over Tva Loop Ramp / Sr-1

Carries Nfa A423 over Tva Loop Ramp / Sr-1, At Sr1 New Johnsonville.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT281 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 7/9Substructure 5/9 · sets the rating

281 ft end to end, longest span 149 ft: about 4 semi-trucks nose to tail. Lengths and the semi-truck 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 multi-beam bridge.

Built200125 years old
Length280.5 ft85.5 m
Daily traffic500counted 2020
Last inspectedJuly 2023every 24 months

Location

StateTennessee
CountyHumphreys
LocationAt Sr1 New Johnsonville
CarriesNfa A423
CrossesTva Loop Ramp / Sr-1
Coordinates36.01853, -87.98309

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignStringer/Multi-beam
Total Length280.5 ft (85.5 m)
Max Span149.0 ft (45.4 m)
Deck Width64.0 ft (19.5 m)
Deck Area1667.2 sq m
Main Spans2
Year Built2001

Traffic

Avg Daily Traffic500 (2020)
Truck Traffic16%
Lanes On Bridge2
Lanes Under Bridge5

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number43SR0010031

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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