US Bridges

NC73 over I77 Nbl

Fair

Mecklenburg County, North Carolina · 0.16 Mi. W. Jct. US21 · Structure no. 000000001190358

Built
1992
33 years old, rebuilt 2013
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
159 ft
3 main spans
Daily traffic
42,500
2022 count
Owner
State
State Highway Agency

About this bridge

NC73 over I77 Nbl is a steel stringer/multi-beam or girder carrying NC73 over I77 Nbl in Mecklenburg County, North Carolina. It was built in 1992 and reconstructed in 2013, so it is 33 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 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 42,500 vehicles a day, roughly 12% of them trucks, projected to reach 85,000 by 2040. The structure is 159 ft (48.4 m) long and 93 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNC73
CrossesI77 Nbl
Location0.16 Mi. W. Jct. US21
RouteState Highway 73
CountyMecklenburg County
StateNorth Carolina
Coordinates35.44237, -80.86842
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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.9 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length159 ft (48.4 m)
Longest span78 ft (23.7 m)
Deck width93 ft (28.3 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,500 (2022)
Projected traffic85,000 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 NC73 over I77 Nbl built?

It was built in 1992, making it 33 years old in 2025. It was reconstructed in 2013.

What condition is NC73 over I77 Nbl 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 May 2024.

How much traffic does NC73 over I77 Nbl carry?

About 42,500 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NC73 over I77 Nbl?

The structure is 159 ft (48.4 m) long with a longest span of 78 ft (23.7 m) and a deck 93 ft wide.

Who owns NC73 over I77 Nbl?

It is owned by the State Highway Agency.