US Bridges

SR1121 over I-77

Fair

Surry County, North Carolina · .2 MI.E.JCT.SR1001 · Structure no. 000000001710147

Built
1974
51 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
355 ft
2 main spans
Daily traffic
1,500
2019 count
Owner
State
State Highway Agency

About this bridge

SR1121 over I-77 is a steel continuous stringer/multi-beam or girder carrying SR1121 over I-77 in Surry County, North Carolina. It was built in 1974, so it is 51 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 1,500 vehicles a day, roughly 6% of them trucks, projected to reach 3,000 by 2040. The structure is 355 ft (108.2 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR1121
CrossesI-77
Location.2 MI.E.JCT.SR1001
RouteState Highway 1121
CountySurry County
StateNorth Carolina
Coordinates36.32365, -80.79564
Functional classRural Local

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.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 15
Structure length355 ft (108.2 m)
Longest span119 ft (36.2 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2019)
Projected traffic3,000 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

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 SR1121 over I-77 built?

It was built in 1974, making it 51 years old in 2025.

What condition is SR1121 over I-77 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 SR1121 over I-77 carry?

About 1,500 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is SR1121 over I-77?

The structure is 355 ft (108.2 m) long with a longest span of 119 ft (36.2 m) and a deck 32 ft wide.

Who owns SR1121 over I-77?

It is owned by the State Highway Agency.