US Bridges

SR1639 over I40

Poor

Iredell County, North Carolina · 300FT. N. Jct. SR1621 · Structure no. 000000000970118

Built
1960
65 years old, rebuilt 1985
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
200 ft
4 main spans
Daily traffic
3,400
2021 count
Owner
State
State Highway Agency

About this bridge

SR1639 over I40 is a steel stringer/multi-beam or girder carrying SR1639 over I40 in Iredell County, North Carolina. It was built in 1960 and reconstructed in 1985, so it is 65 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 3,400 vehicles a day, roughly 7% of them trucks, projected to reach 6,800 by 2040. The structure is 200 ft (60.9 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR1639
CrossesI40
Location300FT. N. Jct. SR1621
RouteState Highway 1639
CountyIredell County
StateNorth Carolina
Coordinates35.79736, -80.92175
Functional classUrban Collector

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be 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 rating64.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length200 ft (60.9 m)
Longest span54 ft (16.4 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (2021)
Projected traffic6,800 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR1639 over I40 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1985.

What condition is SR1639 over I40 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 April 2024.

How much traffic does SR1639 over I40 carry?

About 3,400 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is SR1639 over I40?

The structure is 200 ft (60.9 m) long with a longest span of 54 ft (16.4 m) and a deck 36 ft wide.

Who owns SR1639 over I40?

It is owned by the State Highway Agency.