Structure 54I00750049 · McMinn County, TN

Nfa A446 over I75 Sbl

Carries Nfa A446 over I75 Sbl, 5 Mi From Sr2.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT173 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

173 ft end to end, longest span 87 ft: about 2 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 box-beam bridge.

Built197155 years old
Length172.9 ft52.7 m
Daily traffic242counted 2021
Last inspectedApril 2024every 24 months

Location

StateTennessee
CountyMcMinn
Location5 Mi From Sr2
CarriesNfa A446
CrossesI75 Sbl
Coordinates35.40658, -84.70675

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length172.9 ft (52.7 m)
Max Span86.9 ft (26.5 m)
Deck Width32.2 ft (9.8 m)
Deck Area516.5 sq m
Main Spans3
Year Built1971

Traffic

Avg Daily Traffic242 (2021)
Truck Traffic3%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number54I00750049

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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