US Bridges

I40 Bus US158/421 over US52 US311 & NC8

Fair

Forsyth County, North Carolina · 0.3 Mi.W. Jct. US311&NC8 · Structure no. 000000000670348

Built
1958
67 years old, rebuilt 1998
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
217 ft
4 main spans
Daily traffic
52,000
2020 count
Owner
State
State Highway Agency

About this bridge

I40 Bus US158/421 over US52 US311 & NC8 is a steel stringer/multi-beam or girder carrying I40 Bus US158/421 over US52 US311 & NC8 in Forsyth County, North Carolina. It was built in 1958 and reconstructed in 1998, so it is 67 years old, older than the North Carolina average of 38.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 52,000 vehicles a day, roughly 12% of them trucks, projected to reach 104,000 by 2040. The structure is 217 ft (66.1 m) long and 97 ft wide.

Location

Open in Google Maps
CarriesI40 Bus US158/421
CrossesUS52 US311 & NC8
Location0.3 Mi.W. Jct. US311&NC8
RouteInterstate 40
CountyForsyth County
StateNorth Carolina
Coordinates36.09401, -80.23246
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.9 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length217 ft (66.1 m)
Longest span59 ft (17.9 m)
Deck width97 ft (29.5 m)
Roadway width94 ft (28.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,000 (2020)
Projected traffic104,000 by 2040
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I40 Bus US158/421 over US52 US311 & NC8 built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1998.

What condition is I40 Bus US158/421 over US52 US311 & NC8 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does I40 Bus US158/421 over US52 US311 & NC8 carry?

About 52,000 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is I40 Bus US158/421 over US52 US311 & NC8?

The structure is 217 ft (66.1 m) long with a longest span of 59 ft (17.9 m) and a deck 97 ft wide.

Who owns I40 Bus US158/421 over US52 US311 & NC8?

It is owned by the State Highway Agency.