Structure 670125 · Forsyth County, NC

Us158 over I40 Bus Us158 & Us421

Carries Us158 over I40 Bus Us158 & Us421, 0.3 Mi. S. Jct. Sr1001.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT178 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 7/9Substructure 5/9 · sets the rating

178 ft end to end, longest span 57 ft: about 2 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.

Built1956rebuilt 1995
Length177.8 ft54.2 m
Daily traffic17,500counted 2021
Last inspectedNovember 2023every 24 months

Location

StateNorth Carolina
CountyForsyth
Location0.3 Mi. S. Jct. Sr1001
CarriesUs158
CrossesI40 Bus Us158 & Us421
Coordinates36.09392, -80.27908

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length177.8 ft (54.2 m)
Max Span56.8 ft (17.3 m)
Deck Width74.5 ft (22.7 m)
Deck Area1230.3 sq m
Main Spans4
Year Built1956 (reconstructed 1995)

Traffic

Avg Daily Traffic17,500 (2021)
Truck Traffic6%
Lanes On Bridge5
Lanes Under Bridge6

Inspection & Ownership

Last InspectionNovember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000670125

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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