US Bridges

I77 over Lake Norman

Good

Iredell County, North Carolina · 1.9 Mi. S. Jct. SR1100 · Structure no. 000000000970052

Built
2018
7 years old
Condition
Good
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
122 ft
3 main spans
Daily traffic
63,500
2020 count
Owner
State
State Highway Agency

About this bridge

I77 over Lake Norman is a prestressed concrete stringer/multi-beam or girder carrying I77 over Lake Norman in Iredell County, North Carolina. It was built in 2018, so it is 7 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 63,500 vehicles a day, roughly 16% of them trucks, projected to reach 127,000 by 2040. The structure is 122 ft (37.1 m) long and 114 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI77
CrossesLake Norman
Location1.9 Mi. S. Jct. SR1100
RouteInterstate 77
Coordinates35.56713, -80.85761
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating53.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length122 ft (37.1 m)
Longest span39 ft (11.8 m)
Deck width114 ft (34.7 m)
Roadway width110 ft (33.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic63,500 (2020)
Projected traffic127,000 by 2040
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a toll 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I77 over Lake Norman built?

It was built in 2018, making it 7 years old in 2025.

What condition is I77 over Lake Norman in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2025.

How much traffic does I77 over Lake Norman carry?

About 63,500 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I77 over Lake Norman?

The structure is 122 ft (37.1 m) long with a longest span of 39 ft (11.8 m) and a deck 114 ft wide.

Who owns I77 over Lake Norman?

It is owned by the State Highway Agency.