US 15
Carrying US 15 over PANTHER CREEK
1MI NE OF MCCOLL, Marlboro, South Carolina
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
US 15 in Marlboro, South Carolina sits above 6% of rated South Carolina bridges on inventory load rating (15 t), while its 1925 build year is earlier than 96% of Marlboro's recorded-year cohort (96 bridges).
US 15 in Marlboro, South Carolina is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1925, it carries 1 rated component 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 SC:000000000000950
PRE-1950 · CONCRETE · MULTI-SPAN · CULVERT-LED · ARTERIAL-ADT · LIGHT-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- CONCRETE Concrete
- MULTI-SPAN 3 spans
- CULVERT-LED Culvert-led
- ARTERIAL-ADT Arterial ADT
- LIGHT-LOAD Light 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: US 15
The US 15 bridge in Marlboro, South Carolina carries US 15 over PANTHER CREEK. It was built in 1925, making it 101 years old today. It was last reconstructed in 1939, extending its service life. The structure is built primarily of concrete continuous and spans 3 sections, stretching 10.3 meters (34 feet) end to end. Daily traffic averages 7,000 vehicles, placing it in the moderately-trafficked tier of South Carolina bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert at 4/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules.
How US 15 compares
Age against the county: built in 1925, earlier than 92 of Marlboro's 96 bridges with a recorded construction year (96%), against a county median build year of 1969. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across South Carolina bridges with a recorded inventory load rating (9,483 of 9,490 rated).
US 15 vs every rated South Carolina bridge
Inventory load rating (metric tons), FHWA NBI, this state
15 Top 94% higher than 6% of 9,483 bridges
rated South 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.
Marlboro inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 96 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
- 1925
- Last Reconstructed
- 1939
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 10.3 m (34 ft)
- Deck Width
- 13.4 m (44 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 7,000 vehicles/day
- Structure Number
- 000000000000950
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
US 15 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 US 15 against other structures in Marlboro and across South Carolina. South 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 US 15?
US 15 in Marlboro, South Carolina on the FHWA's 0–9 scale.
How often is US 15 inspected?
US 15'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 7,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. US 15 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 US 15?
US 15 has an NBI inventory load rating of 14.9 metric tons.
Who is responsible for maintaining US 15?
US 15 is owned and maintained by State Highway Agency.
How old is US 15 and does age affect safety?
US 15 was built in 1925, making it 101 years old and last reconstructed in 1939.
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.