I77 SBL
Carrying I77 SBL over NC160
0.6 MI. S. JCT. US74, Mecklenburg, North Carolina
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
I77 SBL in Mecklenburg, North Carolina sits above 37% of rated North Carolina bridges on inventory load rating (36 t), while its 1970 build year is earlier than 79% of Mecklenburg's recorded-year cohort (746 bridges).
I77 SBL in Mecklenburg, North Carolina is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1970, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. The lowest applicable rating sets the federal condition category, so this Fair 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:000000001190213
INTERSTATE-ERA · STEEL · MULTI-SPAN · SUB-LED · HEAVY-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- MULTI-SPAN 3 spans
- SUB-LED Substructure-led
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
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: I77 SBL
The I77 SBL bridge in Mecklenburg, North Carolina carries I77 SBL over NC160. It was built in 1970, making it 56 years old today. It was last reconstructed in 1993, extending its service life. The structure is built primarily of steel and spans 3 sections, stretching 48.4 meters (159 feet) end to end. Daily traffic averages 69,000 vehicles, placing it in the heavily-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 7/9, substructure at 5/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How I77 SBL compares
Age against the county: built in 1970, earlier than 590 of Mecklenburg's 746 bridges with a recorded construction year (79%), against a county median build year of 1992. 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).
I77 SBL vs every rated North Carolina bridge
Inventory load rating (metric tons), FHWA NBI, this state
36 Top 63% higher than 37% 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.
Mecklenburg inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 746 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
- 1970
- Last Reconstructed
- 1993
- Material
- Steel
- Number of Spans
- 3
- Structure Length
- 48.4 m (159 ft)
- Deck Width
- 19.6 m (64 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 69,000 vehicles/day
- Structure Number
- 000000001190213
Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 7/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • 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
This page shows what the last federal inspection recorded, not whether I77 SBL is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare I77 SBL against other structures in Mecklenburg 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 I77 SBL?
I77 SBL in Mecklenburg, North Carolina has a deck rating of 6/9, superstructure rating of 7/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is I77 SBL inspected?
I77 SBL'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 69,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. I77 SBL is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for I77 SBL?
I77 SBL has an NBI inventory load rating of 36.2 metric tons.
Who is responsible for maintaining I77 SBL?
I77 SBL is owned and maintained by State Highway Agency.
How old is I77 SBL and does age affect safety?
I77 SBL was built in 1970, making it 56 years old and last reconstructed in 1993.
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.