US Bridges

I77 Nbl US21 Nbl over NC160

Fair

Mecklenburg County, North Carolina · 0.6 Mi. S. Jct. US74 · Structure no. 000000001190207

Built
1970
55 years old, rebuilt 1993
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
159 ft
3 main spans
Daily traffic
68,000
2022 count
Owner
State
State Highway Agency

About this bridge

I77 Nbl US21 Nbl over NC160 is a steel stringer/multi-beam or girder carrying I77 Nbl US21 Nbl over NC160 in Mecklenburg County, North Carolina. It was built in 1970 and reconstructed in 1993, so it is 55 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 68,000 vehicles a day, roughly 16% of them trucks, projected to reach 136,000 by 2040. The structure is 159 ft (48.4 m) long and 53 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI77 Nbl US21 Nbl
CrossesNC160
Location0.6 Mi. S. Jct. US74
RouteInterstate 77
CountyMecklenburg County
StateNorth Carolina
Coordinates35.21781, -80.87177
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.9 US tons
Inventory rating38.9 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 span83 ft (25.2 m)
Deck width53 ft (16.2 m)
Roadway width50 ft (15.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68,000 (2022)
Projected traffic136,000 by 2040
Trucks16%
Lanes on structure3
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 Nbl US21 Nbl over NC160 built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1993.

What condition is I77 Nbl US21 Nbl over NC160 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 October 2024.

How much traffic does I77 Nbl US21 Nbl over NC160 carry?

About 68,000 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I77 Nbl US21 Nbl over NC160?

The structure is 159 ft (48.4 m) long with a longest span of 83 ft (25.2 m) and a deck 53 ft wide.

Who owns I77 Nbl US21 Nbl over NC160?

It is owned by the State Highway Agency.