SR1639
Carrying SR1639 over I40
300FT. N. JCT. SR1621, Iredell, North Carolina
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
SR1639 in Iredell, North Carolina sits above 35% of rated North Carolina bridges on inventory load rating (35 t), while its 1960 build year is earlier than 79% of Iredell's recorded-year cohort (335 bridges).
SR1639 in Iredell, North Carolina is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1960, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure NC:000000000970118
INTERSTATE-ERA · STEEL · LONG-SPAN-RUN · SUPER-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- LONG-SPAN-RUN 4 spans
- SUPER-LED Superstructure-led
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-POOR Poor
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: SR1639
The SR1639 bridge in Iredell, North Carolina carries SR1639 over I40. It was built in 1960, making it 66 years old today. It was last reconstructed in 1985, extending its service life. The structure is built primarily of steel and spans 4 sections, stretching 60.9 meters (200 feet) end to end. Daily traffic averages 4,200 vehicles, placing it in the moderately-trafficked tier of North Carolina bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 4/9, substructure at 5/9. The weakest component sits in poor condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order.
How SR1639 compares
Age against the county: built in 1960, earlier than 263 of Iredell's 335 bridges with a recorded construction year (79%), against a county median build year of 1973. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across North Carolina bridges with a recorded inventory load rating (19,160 of 19,210 rated).
SR1639 vs every rated North Carolina bridge
Inventory load rating (metric tons), FHWA NBI, this state
35 Top 65% higher than 35% of 19,160 bridges
rated North Carolina bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Iredell inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 335 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1960
- Last Reconstructed
- 1985
- Material
- Steel
- Number of Spans
- 4
- Structure Length
- 60.9 m (200 ft)
- Deck Width
- 10.9 m (36 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 4,200 vehicles/day
- Structure Number
- 000000000970118
Condition Analysis
- • The deck (driving surface) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The superstructure (beams and supports above the deck) rates poor at 4/9, with advanced deterioration recorded on the latest inspection.
- • At 5/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
SR1639 is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare SR1639 against other structures in Iredell and across North Carolina. North Carolina bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for SR1639?
SR1639 in Iredell, North Carolina has a deck rating of 6/9, superstructure rating of 4/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is SR1639 inspected?
SR1639's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 4,200 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SR1639 is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for SR1639?
SR1639 has an NBI inventory load rating of 35.3 metric tons.
Who is responsible for maintaining SR1639?
SR1639 is owned and maintained by State Highway Agency.
How old is SR1639 and does age affect safety?
SR1639 was built in 1960, making it 66 years old and last reconstructed in 1985.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.