Structure 630224 · Durham County, NC

Sr1999 over I40

Carries Sr1999 over I40, 0.3 Mi N Jct Nc 54.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT231 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

231 ft end to end, longest span 118 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.

Built197353 years old
Length231.0 ft70.4 m
Daily traffic24,000counted 2019
Last inspectedAugust 2023every 24 months

Location

StateNorth Carolina
CountyDurham
Location0.3 Mi N Jct Nc 54
CarriesSr1999
CrossesI40
Coordinates35.89443, -78.86006

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length231.0 ft (70.4 m)
Max Span117.8 ft (35.9 m)
Deck Width93.8 ft (28.6 m)
Deck Area2013.4 sq m
Main Spans2
Year Built1973

Traffic

Avg Daily Traffic24,000 (2019)
Truck Traffic6%
Lanes On Bridge6
Lanes Under Bridge10

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000630224

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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