US Bridges

I-77 Sbl over I-77 Nbl

Good

Mecklenburg County, North Carolina · 0.32M. S. Jct. I-85 · Structure no. 000000001190297

Built
2020
5 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
430 ft
5 main spans
Daily traffic
65,000
2020 count
Owner
State
State Highway Agency

About this bridge

I-77 Sbl over I-77 Nbl is a steel stringer/multi-beam or girder carrying I-77 Sbl over I-77 Nbl in Mecklenburg County, North Carolina. It was built in 2020, so it is 5 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 65,000 vehicles a day, roughly 16% of them trucks, projected to reach 130,000 by 2040. The structure is 430 ft (131 m) long and 105 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI-77 Sbl
CrossesI-77 Nbl
Location0.32M. S. Jct. I-85
RouteInterstate 77
Coordinates35.26841, -80.8454
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating51.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length430 ft (131 m)
Longest span188 ft (57.3 m)
Deck width105 ft (32.1 m)
Roadway width102 ft (31.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,000 (2020)
Projected traffic130,000 by 2040
Trucks16%
Lanes on structure6
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 I-77 Sbl over I-77 Nbl built?

It was built in 2020, making it 5 years old in 2025.

What condition is I-77 Sbl over I-77 Nbl 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 March 2024.

How much traffic does I-77 Sbl over I-77 Nbl carry?

About 65,000 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I-77 Sbl over I-77 Nbl?

The structure is 430 ft (131 m) long with a longest span of 188 ft (57.3 m) and a deck 105 ft wide.

Who owns I-77 Sbl over I-77 Nbl?

It is owned by the State Highway Agency.