US Bridges

I77 Ramp over I77 Sbl US21 Sbl

Fair

Mecklenburg County, North Carolina · 0.8 MI.N.JCT.SR2074 · Structure no. 000000001190282

Built
1972
53 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
176 ft
3 main spans
Daily traffic
6,400
2022 count
Owner
State
State Highway Agency

About this bridge

I77 Ramp over I77 Sbl US21 Sbl is a steel stringer/multi-beam or girder carrying I77 Ramp over I77 Sbl US21 Sbl in Mecklenburg County, North Carolina. It was built in 1972, so it is 53 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 6,400 vehicles a day, roughly 16% of them trucks, projected to reach 12,800 by 2040. The structure is 176 ft (53.6 m) long and 29 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI77 Ramp
CrossesI77 Sbl US21 Sbl
Location0.8 MI.N.JCT.SR2074
RouteInterstate 77
CountyMecklenburg County
StateNorth Carolina
Coordinates35.24489, -80.84756
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 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 geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating82.9 US tons
Inventory rating49.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length176 ft (53.6 m)
Longest span69 ft (21 m)
Deck width29 ft (8.9 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2022)
Projected traffic12,800 by 2040
Trucks16%
Lanes on structure1
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 Ramp over I77 Sbl US21 Sbl built?

It was built in 1972, making it 53 years old in 2025.

What condition is I77 Ramp over I77 Sbl US21 Sbl 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 September 2024.

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

About 6,400 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I77 Ramp over I77 Sbl US21 Sbl?

The structure is 176 ft (53.6 m) long with a longest span of 69 ft (21 m) and a deck 29 ft wide.

Who owns I77 Ramp over I77 Sbl US21 Sbl?

It is owned by the State Highway Agency.