Structure 970049 · Iredell County, NC

Us21 over I77

Carries Us21 over I77, 0.1 Mi. W. Jct. Sr1246.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT283 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

283 ft end to end, longest span 77 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.

Built1966rebuilt 2005
Length282.8 ft86.2 m
Daily traffic26,000counted 2021
Last inspectedJanuary 2024every 24 months

Location

StateNorth Carolina
CountyIredell
Location0.1 Mi. W. Jct. Sr1246
CarriesUs21
CrossesI77
Coordinates35.55329, -80.85766

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length282.8 ft (86.2 m)
Max Span76.8 ft (23.4 m)
Deck Width57.4 ft (17.5 m)
Deck Area1508.5 sq m
Main Spans4
Year Built1966 (reconstructed 2005)

Traffic

Avg Daily Traffic26,000 (2021)
Truck Traffic6%
Lanes On Bridge4
Lanes Under Bridge7

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000970049

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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