US Bridges

I85NBUS US29 US70 over SR3346

Poor

Davidson County, North Carolina · 0.8 MI.N.JCT.NC8 · Structure no. 000000000570118

Built
1950
75 years old
Condition
Poor
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
261 ft
4 main spans
Daily traffic
12,000
2022 count
Owner
State
State Highway Agency

About this bridge

I85NBUS US29 US70 over SR3346 is a steel stringer/multi-beam or girder carrying I85NBUS US29 US70 over SR3346 in Davidson County, North Carolina. It was built in 1950, so it is 75 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 12,000 vehicles a day, roughly 12% of them trucks, projected to reach 24,000 by 2040. The structure is 261 ft (79.5 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesI85NBUS US29 US70
CrossesSR3346
Location0.8 MI.N.JCT.NC8
RouteU.S. Route 29
CountyDavidson County
StateNorth Carolina
Coordinates35.83331, -80.23984
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length261 ft (79.5 m)
Longest span64 ft (19.5 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2022)
Projected traffic24,000 by 2040
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 I85NBUS US29 US70 over SR3346 built?

It was built in 1950, making it 75 years old in 2025.

What condition is I85NBUS US29 US70 over SR3346 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does I85NBUS US29 US70 over SR3346 carry?

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

How long is I85NBUS US29 US70 over SR3346?

The structure is 261 ft (79.5 m) long with a longest span of 64 ft (19.5 m) and a deck 35 ft wide.

Who owns I85NBUS US29 US70 over SR3346?

It is owned by the State Highway Agency.