SD063
Carrying SD063 over DRY CK
0.1 N OF NORRIS, Mellette, South Dakota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
SD063 in Mellette, South Dakota sits above 93% of rated South Dakota bridges on inventory load rating (64 t), while its 1984 build year is earlier than 36% of Mellette's recorded-year cohort (28 bridges).
SD063 in Mellette, South Dakota is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 1984, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 8. The lowest applicable rating sets the federal condition category, so this Good 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 SD:000000048020274
LATE-CENTURY · CONCRETE · MULTI-SPAN · CULVERT-LED · ADT-UNK · HEAVY-LOAD · CAT-GOOD
- LATE-CENTURY 1980–1999
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- CULVERT-LED Culvert-led
- ADT-UNK ADT unknown
- HEAVY-LOAD Heavy load
- CAT-GOOD Good
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: SD063
The SD063 bridge in Mellette, South Dakota carries SD063 over DRY CK. It was built in 1984, making it 42 years old today. The structure is built primarily of concrete continuous and spans 2 sections, stretching 7.5 meters (25 feet) end to end. Average daily traffic is not reported for this structure. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert at 8/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range.
How SD063 compares
Age against the county: built in 1984, earlier than 10 of Mellette's 28 bridges with a recorded construction year (36%), against a county median build year of 1973. This is one of the newer structures in its county.
Live comparison across South Dakota bridges with a recorded inventory load rating (5,886 of 5,887 rated).
SD063 vs every rated South Dakota bridge
Inventory load rating (metric tons), FHWA NBI, this state
64 Top 7% higher than 93% of 5,886 bridges
rated South Dakota 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.
Mellette inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 28 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
- 1984
- Material
- Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 7.5 m (25 ft) 0
- Owner
- State Highway Agency
- Structure Number
- 000000048020274
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 SD063 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 SD063 against other structures in Mellette and across South Dakota. South Dakota 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 SD063?
SD063 in Mellette, South Dakota on the FHWA's 0–9 scale.
How often is SD063 inspected?
SD063's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SD063 is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for SD063?
SD063 has an NBI inventory load rating of 64.2 metric tons.
Who is responsible for maintaining SD063?
SD063 is owned and maintained by State Highway Agency.
How old is SD063 and does age affect safety?
SD063 was built in 1984, making it 42 years old.
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.