US Bridges

I-40 over US 21

Good

Iredell County, North Carolina · .9 MI.W.JCT.I-77 · Structure no. 000000000970563

Built
2014
11 years old
Condition
Good
inspected April 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
160 ft
1 main span
Daily traffic
31,500
2019 count
Owner
State
State Highway Agency

About this bridge

I-40 over US 21 is a steel stringer/multi-beam or girder carrying I-40 over US 21 in Iredell County, North Carolina. It was built in 2014, so it is 11 years old, younger than the North Carolina average of 38.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 31,500 vehicles a day, roughly 16% of them trucks, projected to reach 63,000 by 2040. The structure is 160 ft (48.7 m) long and 219 ft wide.

Location

Open in Google Maps
CarriesI-40
CrossesUS 21
Location.9 MI.W.JCT.I-77
RouteInterstate 40
CountyIredell County
StateNorth Carolina
Coordinates35.80739, -80.87602
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating64.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length160 ft (48.7 m)
Longest span155 ft (47.2 m)
Deck width219 ft (66.8 m)
Roadway width208 ft (63.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,500 (2019)
Projected traffic63,000 by 2040
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
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 I-40 over US 21 built?

It was built in 2014, making it 11 years old in 2025.

What condition is I-40 over US 21 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2022.

How much traffic does I-40 over US 21 carry?

About 31,500 vehicles per day (2019 count), of which roughly 16% are trucks.

How long is I-40 over US 21?

The structure is 160 ft (48.7 m) long with a longest span of 155 ft (47.2 m) and a deck 219 ft wide.

Who owns I-40 over US 21?

It is owned by the State Highway Agency.