Structure 220A3400003 · Dickson County, TN

Nfa A241 348073a over Csx Railroad (mbsp)

Carries Nfa A241 348073a over Csx Railroad (mbsp), In Montgomery Bell St. Pk.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT142 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

142 ft end to end. 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 through truss.

Built201016 years old
Length142.1 ft43.3 m
Daily traffic210counted 2020
Last inspectedApril 2024every 24 months

Location

StateTennessee
CountyDickson
LocationIn Montgomery Bell St. Pk
CarriesNfa A241 348073a
CrossesCsx Railroad (mbsp)
Coordinates36.07830, -87.26498

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length142.1 ft (43.3 m)
Max Span135.8 ft (41.4 m)
Deck Width30.5 ft (9.3 m)
Deck Area402.7 sq m
Main Spans1
Year Built2010

Traffic

Avg Daily Traffic210 (2020)
Truck Traffic2%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Park/Forest Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number220A3400003

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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