Structure 65023780001 · Morgan County, TN

Nfa 2378 (sa 6502) over Crab Orchard Creek

Carries Nfa 2378 (sa 6502) over Crab Orchard Creek, 3.5 M NW Of Oakdale.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT234 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

234 ft end to end, longest span 59 ft: about 3 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.

Built198640 years old
Length233.9 ft71.3 m
Daily traffic188counted 2021
Last inspectedMarch 2023every 24 months

Location

StateTennessee
CountyMorgan
Location3.5 M NW Of Oakdale
CarriesNfa 2378 (sa 6502)
CrossesCrab Orchard Creek
Coordinates36.01063, -84.61105

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length233.9 ft (71.3 m)
Max Span59.1 ft (18 m)
Deck Width26.2 ft (8 m)
Deck Area570.4 sq m
Main Spans4
Year Built1986

Traffic

Avg Daily Traffic188 (2021)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number65023780001

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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