Structure 630160 · Durham County, NC

Nc147s over Blackwell St.

Carries Nc147s over Blackwell St., 0.2 Mi.n.jct.us501.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT313 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9Substructure 5/9 · sets the rating

313 ft end to end, longest span 95 ft: about 4 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.

Built196858 years old
Length313.0 ft95.4 m
Daily traffic25,750counted 2020
Last inspectedSeptember 2023every 24 months

Location

StateNorth Carolina
CountyDurham
Location0.2 Mi.n.jct.us501
CarriesNc147s
CrossesBlackwell St.
Coordinates35.99094, -78.90600

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length313.0 ft (95.4 m)
Max Span95.1 ft (29 m)
Deck Width56.1 ft (17.1 m)
Deck Area1631.3 sq m
Main Spans5
Year Built1968

Traffic

Avg Daily Traffic25,750 (2020)
Truck Traffic12%
Lanes On Bridge3
Lanes Under Bridge5

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000630160

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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