US Bridges

I-77 over Duck Creek

Fair

Iredell County, North Carolina · 1.1 Mile North JCT.SR2342 · Structure no. 000000000970577

Built
1970
55 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
56,500
2020 count
Owner
State
State Highway Agency

About this bridge

I-77 over Duck Creek is a concrete continuous culvert carrying I-77 over Duck Creek in Iredell County, North Carolina. It was built in 1970, 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 56,500 vehicles a day, roughly 16% of them trucks, projected to reach 113,000 by 2040. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesI-77
CrossesDuck Creek
Location1.1 Mile North JCT.SR2342
RouteInterstate 77
CountyIredell County
StateNorth Carolina
Coordinates35.73675, -80.85911
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.4 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,500 (2020)
Projected traffic113,000 by 2040
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 I-77 over Duck Creek built?

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

What condition is I-77 over Duck 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 2023.

How much traffic does I-77 over Duck Creek carry?

About 56,500 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I-77 over Duck Creek?

The structure is 21 ft (6.4 m) long with a longest span of 9 ft (2.7 m).

Who owns I-77 over Duck Creek?

It is owned by the State Highway Agency.