Iona, SD truck route planning & crash data
Plan safer truck routes in Iona: commercial truck and garbage truck crashes in Iona and Lyman County, dangerous roads, seasonality and route safety data for fleets. Patterns use Lyman County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
0 of 139 truck crashes since 2015.
Deadliest roads
How Lyman County compares with South Dakota
Lyman County against South Dakota and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Lyman County stands out
Full comparison
| Measure (2015–2025) | Lyman County | South Dakota | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 320.1 | 42.0 | 49.7 | 7.6× the state |
| Deaths per 100 crashes | 5.3 | 5.2 | 3.4 | same |
| Injuries per crash | 0.12 | 0.13 | 0.49 | 8% below the state |
| Garbage-truck share | 0.0% | 1.6% | 2.3% | 100% below the state |
| On snow, slush or ice | 40.5% | 28.6% | 6.2% | 1.4× the state |
| Morning rush (6–10 am) | 19.1% | 22.2% | 23.7% | 14% below the state |
| In rain, sleet or snow | 24.4% | 17.5% | 13.8% | 1.4× the state |
| Winter months (Nov–Mar) | 55.7% | 48.8% | 41.9% | 1.1× the state |
| After dark | 35.1% | 22.8% | 24.8% | 1.5× the state |
Lyman County has lower values than South Dakota for injuries per crash, garbage-truck share and morning rush (6–10 am). It stands out for higher crashes per 100k residents / yr, on snow, slush or ice and in rain, sleet or snow.
The headline for Lyman County: January worst month: 20.1% of truck crashes, vs 8.3% in an average month.
Overview
Lyman County has recorded 139 truck crashes since 2015, with 25 people injured and 14 killed.
That averages about one truck crash every 31 days in fully reported years.
Only 0 truck crashes were reported in Iona since 2015; patterns below come from Lyman County as a whole.
When crashes happen
Truck crashes peak in January (20.1% of the year) and are lowest in February (3.6%).
November through March accounts for 55.7% of truck crashes here, compared with 48.8% in South Dakota.
More truck crashes happen at 8–9 am than at any other hour (7.9%).
40.5% of truck crashes here happened on snow, slush or ice, against 28.6% across South Dakota.
Where crashes happen
Fatal large-truck crashes within 10 miles of Iona since 2015 were spread across roads: SR-47 (2).
Garbage & waste trucks
No crashes involving garbage or refuse trucks have been reported in Lyman County since 2015.
Route planning tips for Iona fleets
- Build extra time into January routes: it has the most truck crashes here.
- Icy and snowy roads show up in 40.5% of truck crashes here, more than South Dakota; schedule winter checks early.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
About the data
Sources: the FMCSA crash file for all reported truck crashes and NHTSA FARS for fatal crashes with a large truck. Every statement here comes straight from those numbers.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in Lyman County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| SR-47 | 2 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Lyman County) |
|---|---|
| I-90 | 89 |
| Sd Hwy 47 | 22 |
| US-83 | 10 |
| Sd Hwy 248 | 3 |
| 0.169 Miles W Of 324 Ave | 2 |
| Ave | 2 |
| Sd Hwy 273 | 2 |
| US-183 | 2 |
Iona at a glance
| Population | 65 |
| Land area | 127.9 sq mi |
| Density | 1 per sq mi |
| Median household income (ZIP 57534) | $33,438 |
Historical data: truck crashes in Lyman County since the 1990s
Combines the FMCSA crash file (all reported truck crashes, real coverage from about 1990) with NHTSA FARS (fatal crashes involving a large truck, 1982–2024).
| Decade | Truck crashes / yr | Change | Fatal crashes / yr (FARS) |
|---|---|---|---|
| 1990s | 7 | — | 0.4 |
| 2000s | 8 | +19% | 0.2 |
| 2010s | 9 | +18% | 0.3 |
| 2020s | 14 | +47% | 0.4 |
Reported truck crashes averaged 7 a year in the 1990s and 14 a year in the 2020s. Reporting practices changed over time, so part of any change can come from reporting. Fatal crashes involving a large truck averaged 0.5 a year in 2016–19 and 0.4 a year in 2020–24.
Nearby places
Questions fleets ask about Iona
How many truck accidents are there in Iona?
139 truck crashes have been reported in Lyman County since 2015, with 14 deaths and 25 injuries.
When do most truck crashes happen in Iona?
January has the most truck crashes in Lyman County, 20.1% of the yearly total.
How many garbage truck accidents happen in Iona?
Garbage trucks were involved in 0 reported crashes in Lyman County since 2015 (0.0% of truck crashes).
How do truck crashes in Iona compare with South Dakota?
Lyman County records 320.1 truck crashes per 100,000 residents a year, against 42.0 across South Dakota.
What is the best way to plan truck routes in Iona?
Use the free Route Planner: enter your stops to get a risk score, safer alternatives and the low bridges on your route.
2026 is a partial year. Updated October 2026.