105 St
Carrying 105 St over BOIS DE SIOUX R
7 MILES E. OF ROSHOLT SD, Roberts, South Dakota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
105 St in Roberts, South Dakota sits above 84% of rated South Dakota bridges on inventory load rating (45 t), while its 1930 build year is earlier than 94% of Roberts's recorded-year cohort (157 bridges).
105 St in Roberts, South Dakota is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1930, 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 SD:000000055313050
PRE-1950 · STEEL · MULTI-SPAN · SUB-LED · LOCAL-ADT · HEAVY-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- STEEL Steel
- MULTI-SPAN 3 spans
- SUB-LED Substructure-led
- LOCAL-ADT Local ADT
- HEAVY-LOAD Heavy 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: 105 St
The 105 St bridge in Roberts, South Dakota carries 105 St over BOIS DE SIOUX R. It was built in 1930, making it 96 years old today. The structure is built primarily of steel and spans 3 sections, stretching 15.5 meters (51 feet) end to end. Daily traffic averages 200 vehicles, placing it in the lower-traffic tier of South Dakota bridges. It is owned and maintained by Army Corps of Engineers.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 5/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range.
How 105 St compares
Age against the county: built in 1930, earlier than 148 of Roberts's 157 bridges with a recorded construction year (94%), 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).
105 St vs every rated South Dakota bridge
Inventory load rating (metric tons), FHWA NBI, this state
45 Top 16% higher than 84% 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
- 1930
- Material
- Steel
- Number of Spans
- 3
- Structure Length
- 15.5 m (51 ft)
- Deck Width
- 8.4 m (28 ft)
- Owner
- Army Corps of Engineers
- Avg Daily Traffic
- 200 vehicles/day
- Structure Number
- 000000055313050
Condition Analysis
- • The deck (driving surface) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • At 6/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • 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 105 St 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 105 St 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 105 St?
105 St in Roberts, South Dakota has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is 105 St inspected?
105 St'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 200 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 105 St 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 105 St?
105 St has an NBI inventory load rating of 45.0 metric tons.
Who is responsible for maintaining 105 St?
105 St is owned and maintained by Army Corps of Engineers.
How old is 105 St and does age affect safety?
105 St was built in 1930, making it 96 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.