Structure 500A4210001 · Lawrence County, TN

Nfa A421 over Second Creek

Carries Nfa A421 over Second Creek, 4.5 M. E. Loretto..

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
22 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

22 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. 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.

Built1960rebuilt 1975
Length22.0 ft6.7 m
Daily traffic220counted 2020
Last inspectedMay 2023every 24 months

Location

StateTennessee
CountyLawrence
Location4.5 M. E. Loretto.
CarriesNfa A421
CrossesSecond Creek
Coordinates35.07705, -87.34127

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length22.0 ft (6.7 m)
Max Span21.3 ft (6.5 m)
Deck Width29.9 ft (9.1 m)
Deck Area61.0 sq m
Main Spans1
Year Built1960 (reconstructed 1975)

Traffic

Avg Daily Traffic220 (2020)
Truck Traffic2%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number500A4210001

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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