US Bridges

I-77 Nbl over Rocky Creek

Fair

Iredell County, North Carolina · 3.1 Mi. S. Jct. NC901 · Structure no. 000000000970206

Built
1972
53 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
240 ft
4 main spans
Daily traffic
14,750
2020 count
Owner
State
State Highway Agency

About this bridge

I-77 Nbl over Rocky Creek is a steel stringer/multi-beam or girder carrying I-77 Nbl over Rocky Creek in Iredell County, North Carolina. It was built in 1972, so it is 53 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 5 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 14,750 vehicles a day, roughly 23% of them trucks, projected to reach 29,500 by 2040. The structure is 240 ft (73.1 m) long and 42 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI-77 Nbl
CrossesRocky Creek
Location3.1 Mi. S. Jct. NC901
RouteInterstate 77
CountyIredell County
StateNorth Carolina
Coordinates35.96546, -80.84395
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating50.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length240 ft (73.1 m)
Longest span59 ft (17.9 m)
Deck width42 ft (12.9 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,750 (2020)
Projected traffic29,500 by 2040
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-77 Nbl over Rocky Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-77 Nbl over Rocky Creek 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 June 2024.

How much traffic does I-77 Nbl over Rocky Creek carry?

About 14,750 vehicles per day (2020 count), of which roughly 23% are trucks.

How long is I-77 Nbl over Rocky Creek?

The structure is 240 ft (73.1 m) long with a longest span of 59 ft (17.9 m) and a deck 42 ft wide.

Who owns I-77 Nbl over Rocky Creek?

It is owned by the State Highway Agency.