US Bridges

SR3100 over Lake Norman

Good

Iredell County, North Carolina · 0.37 Mi. W. Jct. SR3102 · Structure no. 000000000970548

Built
1999
26 years old
Condition
Good
inspected February 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
512 ft
6 main spans
Daily traffic
700
2022 count
Owner
State
State Highway Agency

About this bridge

SR3100 over Lake Norman is a prestressed concrete stringer/multi-beam or girder carrying SR3100 over Lake Norman in Iredell County, North Carolina. It was built in 1999, so it is 26 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 700 vehicles a day, roughly 6% of them trucks, projected to reach 1,400 by 2040. The structure is 512 ft (156 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSR3100
CrossesLake Norman
Location0.37 Mi. W. Jct. SR3102
RouteState Highway 3100
Coordinates35.6667, -80.96308
Functional classRural Local

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 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating52.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length512 ft (156 m)
Longest span84 ft (25.6 m)
Deck width27 ft (8.2 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2022)
Projected traffic1,400 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR3100 over Lake Norman built?

It was built in 1999, making it 26 years old in 2025.

What condition is SR3100 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 2022.

How much traffic does SR3100 over Lake Norman carry?

About 700 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is SR3100 over Lake Norman?

The structure is 512 ft (156 m) long with a longest span of 84 ft (25.6 m) and a deck 27 ft wide.

Who owns SR3100 over Lake Norman?

It is owned by the State Highway Agency.