466th Avenue
Carrying 466th Avenue over Creek
3.5N & 1W of Wilmot, Roberts, South Dakota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
466th Avenue in Roberts, South Dakota sits above 6% of rated South Dakota bridges on inventory load rating (11 t), while its 1940 build year is earlier than 78% of Roberts's recorded-year cohort (157 bridges).
466th Avenue in Roberts, South Dakota is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1940, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 3. 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 SD:000000055170324
PRE-1950 · TIMBER · MULTI-SPAN · SUB-LED · TRACE-ADT · LIGHT-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- TIMBER Wood or timber
- MULTI-SPAN 2 spans
- SUB-LED Substructure-led
- TRACE-ADT Trace 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: 466th Avenue
The 466th Avenue bridge in Roberts, South Dakota carries 466th Avenue over Creek. It was built in 1940, making it 86 years old today. The structure is built primarily of wood or timber and spans 2 sections, stretching 7.5 meters (25 feet) end to end. Daily traffic averages 32 vehicles, placing it in the lower-traffic tier of South Dakota bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 3/9. 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 466th Avenue compares
Age against the county: built in 1940, earlier than 122 of Roberts's 157 bridges with a recorded construction year (78%), against a county median build year of 1976. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across South Dakota bridges with a recorded inventory load rating (5,886 of 5,887 rated).
466th Avenue vs every rated South Dakota bridge
Inventory load rating (metric tons), FHWA NBI, this state
11 Top 94% higher than 6% 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.
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.
Roberts inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 157 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
- 1940
- Material
- Wood or Timber
- Number of Spans
- 2
- Structure Length
- 7.5 m (25 ft)
- Deck Width
- 7.4 m (24 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 32 vehicles/day
- Structure Number
- 000000055170324
Condition Analysis
- • At 5/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) rates poor at 3/9, with advanced deterioration recorded on the latest inspection.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
466th Avenue 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 466th Avenue against other structures in Roberts 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 466th Avenue?
466th Avenue in Roberts, South Dakota has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 3/9 on the FHWA's 0–9 scale.
How often is 466th Avenue inspected?
466th Avenue'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 32 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 466th Avenue 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 466th Avenue?
466th Avenue has an NBI inventory load rating of 11.0 metric tons.
Who is responsible for maintaining 466th Avenue?
466th Avenue is owned and maintained by County Highway Agency.
How old is 466th Avenue and does age affect safety?
466th Avenue was built in 1940, making it 86 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.