US Bridges

I77 Sbl over Patterson Creek

Fair

Iredell County, North Carolina · 0.8 Mi. N. Jct. SR1890 · Structure no. 000000000970201

Built
1975
50 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
266 ft
4 main spans
Daily traffic
14,750
2020 count
Owner
State
State Highway Agency

About this bridge

I77 Sbl over Patterson Creek is a steel continuous stringer/multi-beam or girder carrying I77 Sbl over Patterson Creek in Iredell County, North Carolina. It was built in 1975, so it is 50 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 266 ft (81 m) long and 42 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI77 Sbl
CrossesPatterson Creek
Location0.8 Mi. N. Jct. SR1890
RouteInterstate 77
CountyIredell County
StateNorth Carolina
Coordinates35.92777, -80.85623
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating71 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length266 ft (81 m)
Longest span66 ft (20.1 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 I77 Sbl over Patterson Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is I77 Sbl over Patterson 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 May 2024.

How much traffic does I77 Sbl over Patterson Creek carry?

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

How long is I77 Sbl over Patterson Creek?

The structure is 266 ft (81 m) long with a longest span of 66 ft (20.1 m) and a deck 42 ft wide.

Who owns I77 Sbl over Patterson Creek?

It is owned by the State Highway Agency.