Structure 630344 · Durham County, NC

Nc147n over Southern Railway

Carries Nc147n over Southern Railway, .34mi.n.jct.sr1314.

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
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT189 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

189 ft end to end, longest span 95 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.

Built199630 years old
Length189.0 ft57.6 m
Daily traffic11,500counted 2019
Last inspectedDecember 2021every 48 months

Location

StateNorth Carolina
CountyDurham
Location.34mi.n.jct.sr1314
CarriesNc147n
CrossesSouthern Railway
Coordinates36.02977, -78.96208

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length189.0 ft (57.6 m)
Max Span94.8 ft (28.9 m)
Deck Width40.7 ft (12.4 m)
Deck Area714.2 sq m
Main Spans3
Year Built1996

Traffic

Avg Daily Traffic11,500 (2019)
Truck Traffic12%
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000630344

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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