US Bridges

SR1129 over I85 US29 US70

Fair

Guilford County, North Carolina · 0.25 Mi. N. Jct. SR1116 · Structure no. 000000000810169

Built
1974
51 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
330 ft
2 main spans
Daily traffic
12,000
2022 count
Owner
State
State Highway Agency

About this bridge

SR1129 over I85 US29 US70 is a steel continuous stringer/multi-beam or girder carrying SR1129 over I85 US29 US70 in Guilford 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 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 12,000 vehicles a day, roughly 6% of them trucks, projected to reach 24,000 by 2040. The structure is 330 ft (100.5 m) long and 70 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR1129
CrossesI85 US29 US70
Location0.25 Mi. N. Jct. SR1116
RouteState Highway 1129
CountyGuilford County
StateNorth Carolina
Coordinates35.99736, -79.86468
Functional classUrban Minor Arterial

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 inspectionSeptember 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length330 ft (100.5 m)
Longest span118 ft (35.9 m)
Deck width70 ft (21.3 m)
Roadway width68 ft (20.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2022)
Projected traffic24,000 by 2040
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed0.6 mi (1 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 SR1129 over I85 US29 US70 built?

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

What condition is SR1129 over I85 US29 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 September 2024.

How much traffic does SR1129 over I85 US29 US70 carry?

About 12,000 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is SR1129 over I85 US29 US70?

The structure is 330 ft (100.5 m) long with a longest span of 118 ft (35.9 m) and a deck 70 ft wide.

Who owns SR1129 over I85 US29 US70?

It is owned by the State Highway Agency.