Structure 630156 · Durham County, NC

Sr1445 over Nc147

Carries Sr1445 over Nc147, 0.3 Mi.s.jct.sr1127.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · 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 6/9 · sets the ratingSubstructure 6/9 · sets the rating

234 ft end to end, longest span 78 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.

Built196858 years old
Length233.9 ft71.3 m
Daily traffic4,900counted 2021
Last inspectedSeptember 2023every 24 months

Location

StateNorth Carolina
CountyDurham
Location0.3 Mi.s.jct.sr1127
CarriesSr1445
CrossesNc147
Coordinates35.99266, -78.90884

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length233.9 ft (71.3 m)
Max Span77.8 ft (23.7 m)
Deck Width52.2 ft (15.9 m)
Deck Area1133.7 sq m
Main Spans4
Year Built1968

Traffic

Avg Daily Traffic4,900 (2021)
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 Number000000000630156

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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