US Bridges

I77 Sbl over US21 & NC115

Fair

Iredell County, North Carolina · 0.5 Mi. S. Jct. SR2375 · Structure no. 000000000970098

Built
1968
57 years old, rebuilt 1985
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
225 ft
4 main spans
Daily traffic
27,000
2020 count
Owner
State
State Highway Agency

About this bridge

I77 Sbl over US21 & NC115 is a steel stringer/multi-beam or girder carrying I77 Sbl over US21 & NC115 in Iredell County, North Carolina. It was built in 1968 and reconstructed in 1985, 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 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 27,000 vehicles a day, roughly 16% of them trucks, projected to reach 54,000 by 2040. The structure is 225 ft (68.5 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 Sbl
CrossesUS21 & NC115
Location0.5 Mi. S. Jct. SR2375
RouteInterstate 77
CountyIredell County
StateNorth Carolina
Coordinates35.67453, -80.8565
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.9 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 length225 ft (68.5 m)
Longest span67 ft (20.4 m)
Deck width50 ft (15.3 m)
Roadway width48 ft (14.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,000 (2020)
Projected traffic54,000 by 2040
Trucks16%
Lanes on structure2
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 Sbl over US21 & NC115 built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1985.

What condition is I77 Sbl 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 Sbl over US21 & NC115 carry?

About 27,000 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I77 Sbl over US21 & NC115?

The structure is 225 ft (68.5 m) long with a longest span of 67 ft (20.4 m) and a deck 50 ft wide.

Who owns I77 Sbl over US21 & NC115?

It is owned by the State Highway Agency.