US Bridges

NC24 over I77

Fair

Mecklenburg County, North Carolina · 0.38 Mi. W. Jct. US21 · Structure no. 000000001190349

Built
1975
50 years old, rebuilt 2013
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
356 ft
3 main spans
Daily traffic
34,000
2022 count
Owner
State
State Highway Agency

About this bridge

NC24 over I77 is a steel continuous stringer/multi-beam or girder carrying NC24 over I77 in Mecklenburg County, North Carolina. It was built in 1975 and reconstructed in 2013, so it is 50 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 34,000 vehicles a day, roughly 12% of them trucks, projected to reach 68,000 by 2040. The structure is 356 ft (108.5 m) long and 92 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNC24
CrossesI77
Location0.38 Mi. W. Jct. US21
RouteState Highway 24
CountyMecklenburg County
StateNorth Carolina
Coordinates35.34828, -80.84719
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating40.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20 + Mod
Structure length356 ft (108.5 m)
Longest span102 ft (31 m)
Deck width92 ft (28.1 m)
Roadway width79 ft (24 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,000 (2022)
Projected traffic68,000 by 2040
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NC24 over I77 built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 2013.

What condition is NC24 over I77 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 August 2024.

How much traffic does NC24 over I77 carry?

About 34,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NC24 over I77?

The structure is 356 ft (108.5 m) long with a longest span of 102 ft (31 m) and a deck 92 ft wide.

Who owns NC24 over I77?

It is owned by the State Highway Agency.