Structure 33021520001 · Hamilton County, TN

Nfa D940 over Johnson Branch

Carries Nfa D940 over Johnson Branch, .1 Mi N Of Ga-tn State LN.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructuresets the rating5/9 · Fair
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
23 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 5/9 · sets the ratingSubstructure 7/9

23 ft end to end, longest span 10 ft. 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 slab bridge.

Built1935rebuilt 1970
Length23.0 ft7 m
Daily traffic2,633counted 2021
Last inspectedFebruary 2024every 24 months

Location

StateTennessee
CountyHamilton
Location.1 Mi N Of Ga-tn State LN
CarriesNfa D940
CrossesJohnson Branch
Coordinates34.98777, -85.06287

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length23.0 ft (7 m)
Max Span9.5 ft (2.9 m)
Deck Width28.9 ft (8.8 m)
Deck Area61.6 sq m
Main Spans2
Year Built1935 (reconstructed 1970)

Traffic

Avg Daily Traffic2,633 (2021)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number33021520001

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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