US Bridges

NC150 over I77

Fair

Iredell County, North Carolina · 0.4 Mi. E. Jct. SR1474 · Structure no. 000000000970026

Built
1966
59 years old, rebuilt 2012
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
241 ft
4 main spans
Daily traffic
35,500
2021 count
Owner
State
State Highway Agency

About this bridge

NC150 over I77 is a prestressed concrete stringer/multi-beam or girder carrying NC150 over I77 in Iredell County, North Carolina. It was built in 1966 and reconstructed in 2012, so it is 59 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 35,500 vehicles a day, roughly 12% of them trucks, projected to reach 71,000 by 2040. The structure is 241 ft (73.4 m) long and 76 ft wide.

CarriesNC150
CrossesI77
Location0.4 Mi. E. Jct. SR1474
RouteState Highway 150
Coordinates35.59393, -80.85982
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 rating99 US tons
Inventory rating47 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length241 ft (73.4 m)
Longest span65 ft (19.8 m)
Deck width76 ft (23.1 m)
Roadway width73 ft (22.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,500 (2021)
Projected traffic71,000 by 2040
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NC150 over I77 built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2012.

What condition is NC150 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 January 2024.

How much traffic does NC150 over I77 carry?

About 35,500 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is NC150 over I77?

The structure is 241 ft (73.4 m) long with a longest span of 65 ft (19.8 m) and a deck 76 ft wide.

Who owns NC150 over I77?

It is owned by the State Highway Agency.