US Bridges

I77 Sbl over US70

Fair

Iredell County, North Carolina · 0.2 Mi. S. Jct. SR2735 · Structure no. 000000000970139

Built
1957
68 years old, rebuilt 1964
Condition
Fair
inspected March 2024
Type
Tee Beam
Concrete
Length
161 ft
3 main spans
Daily traffic
27,750
2020 count
Owner
State
State Highway Agency

About this bridge

I77 Sbl over US70 is a concrete tee beam carrying I77 Sbl over US70 in Iredell County, North Carolina. It was built in 1957 and reconstructed in 1964, so it is 68 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 27,750 vehicles a day, roughly 16% of them trucks, projected to reach 55,500 by 2040. The structure is 161 ft (49 m) long and 45 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI77 Sbl
CrossesUS70
Location0.2 Mi. S. Jct. SR2735
RouteInterstate 77
CountyIredell County
StateNorth Carolina
Coordinates35.77257, -80.86327
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating37.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length161 ft (49 m)
Longest span57 ft (17.3 m)
Deck width45 ft (13.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,750 (2020)
Projected traffic55,500 by 2040
Trucks16%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I77 Sbl over US70 built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1964.

What condition is I77 Sbl over US70 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 March 2024.

How much traffic does I77 Sbl over US70 carry?

About 27,750 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I77 Sbl over US70?

The structure is 161 ft (49 m) long with a longest span of 57 ft (17.3 m) and a deck 45 ft wide.

Who owns I77 Sbl over US70?

It is owned by the State Highway Agency.