US Bridges

I77 Nbl over US21 & NC115

Fair

Iredell County, North Carolina · 0.5 MI.S.JCT.SR2375 · Structure no. 000000000970097

Built
1968
57 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
226 ft
4 main spans
Daily traffic
26,750
2020 count
Owner
State
State Highway Agency

About this bridge

I77 Nbl over US21 & NC115 is a steel stringer/multi-beam or girder carrying I77 Nbl over US21 & NC115 in Iredell County, North Carolina. It was built in 1968, so it is 57 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 6 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 26,750 vehicles a day, roughly 16% of them trucks, projected to reach 53,500 by 2040. The structure is 226 ft (68.8 m) long and 50 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI77 Nbl
CrossesUS21 & NC115
Location0.5 MI.S.JCT.SR2375
RouteInterstate 77
CountyIredell County
StateNorth Carolina
Coordinates35.67429, -80.85634
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.9 US tons
Inventory rating39.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length226 ft (68.8 m)
Longest span68 ft (20.7 m)
Deck width50 ft (15.3 m)
Roadway width48 ft (14.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,750 (2020)
Projected traffic53,500 by 2040
Trucks16%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed0.6 mi (1 km)
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 I77 Nbl over US21 & NC115 built?

It was built in 1968, making it 57 years old in 2025.

What condition is I77 Nbl over US21 & NC115 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 February 2024.

How much traffic does I77 Nbl over US21 & NC115 carry?

About 26,750 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I77 Nbl over US21 & NC115?

The structure is 226 ft (68.8 m) long with a longest span of 68 ft (20.7 m) and a deck 50 ft wide.

Who owns I77 Nbl over US21 & NC115?

It is owned by the State Highway Agency.