US Bridges

I77 Sbl Ramp over I77 I485 & US21

Good

Mecklenburg County, North Carolina · 0.15 Mi. S. Jct. SR2116 · Structure no. 000000001190969

Built
2008
17 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,763 ft
11 main spans
Daily traffic
14,500
2021 count
Owner
State
State Highway Agency

About this bridge

I77 Sbl Ramp over I77 I485 & US21 is a steel continuous stringer/multi-beam or girder carrying I77 Sbl Ramp over I77 I485 & US21 in Mecklenburg County, North Carolina. It was built in 2008, so it is 17 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 14,500 vehicles a day, roughly 16% of them trucks, projected to reach 29,000 by 2040. The structure is 1,763 ft (537.3 m) long and 46 ft wide.

Location

Open in Google Maps
CarriesI77 Sbl Ramp
CrossesI77 I485 & US21
Location0.15 Mi. S. Jct. SR2116
RouteInterstate 77
CountyMecklenburg County
StateNorth Carolina
Coordinates35.36376, -80.84118
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 inspectionMay 2023
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 rating54.9 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20 + Mod
Structure length1,763 ft (537.3 m)
Longest span196 ft (59.7 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,500 (2021)
Projected traffic29,000 by 2040
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesThird level (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 I77 Sbl Ramp over I77 I485 & US21 built?

It was built in 2008, making it 17 years old in 2025.

What condition is I77 Sbl Ramp over I77 I485 & US21 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 May 2023.

How much traffic does I77 Sbl Ramp over I77 I485 & US21 carry?

About 14,500 vehicles per day (2021 count), of which roughly 16% are trucks.

How long is I77 Sbl Ramp over I77 I485 & US21?

The structure is 1,763 ft (537.3 m) long with a longest span of 196 ft (59.7 m) and a deck 46 ft wide.

Who owns I77 Sbl Ramp over I77 I485 & US21?

It is owned by the State Highway Agency.