US Bridges

I-77 Nbl over NC89

Fair

Surry County, North Carolina · .5 MI.N.JCT.SR1397 · Structure no. 000000001710198

Built
1975
50 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
251 ft
3 main spans
Daily traffic
10,750
2020 count
Owner
State
State Highway Agency

About this bridge

I-77 Nbl over NC89 is a steel stringer/multi-beam or girder carrying I-77 Nbl over NC89 in Surry 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 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 10,750 vehicles a day, roughly 23% of them trucks, projected to reach 21,500 by 2040. The structure is 251 ft (76.5 m) long and 50 ft wide.

Location

Open in Google Maps
CarriesI-77 Nbl
CrossesNC89
Location.5 MI.N.JCT.SR1397
RouteInterstate 77
CountySurry County
StateNorth Carolina
Coordinates36.4845, -80.75047
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length251 ft (76.5 m)
Longest span143 ft (43.5 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,750 (2020)
Projected traffic21,500 by 2040
Trucks23%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 Nbl over NC89 built?

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

What condition is I-77 Nbl over NC89 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 December 2023.

How much traffic does I-77 Nbl over NC89 carry?

About 10,750 vehicles per day (2020 count), of which roughly 23% are trucks.

How long is I-77 Nbl over NC89?

The structure is 251 ft (76.5 m) long with a longest span of 143 ft (43.5 m) and a deck 50 ft wide.

Who owns I-77 Nbl over NC89?

It is owned by the State Highway Agency.