Lyman County, SD truck route planning & crash data
Plan safer truck routes in Lyman County: commercial truck and garbage truck crashes, dangerous roads, seasonality and route safety data for fleets.
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 |
Compared with South Dakota, Lyman County is lower on injuries per crash, garbage-truck share and morning rush (6–10 am). It runs above South Dakota on crashes per 100k residents / yr, on snow, slush or ice and in rain, sleet or snow.
What stands out in Lyman County: January the month with the most truck crashes: 20.1% of the year's total.
Overview
Since 2015, 139 crashes involving commercial trucks have been reported in Lyman County. They injured 25 people and killed 14.
In complete reporting years that works out to about one truck crash every 31 days.
When crashes happen
Truck crashes peak in January (20.1% of the year) and are lowest in February (3.6%).
The five winter months (November to March) hold 55.7% of truck crashes, against 48.8% across South Dakota.
More truck crashes happen at 8–9 am than at any other hour (7.9%).
Road surface: 40.5% of truck crashes were on snow, slush or ice (South Dakota: 28.6%).
Where crashes happen
Fatal large-truck crashes in Lyman County since 2015 were spread across roads: I-90 (2) and SR-47 (2).
Garbage & waste trucks
Since 2015, no garbage-truck crashes were reported for Lyman County.
Route planning tips for Lyman County fleets
- Review driver schedules for January, the month with the most truck crashes.
- With 40.5% of truck crashes on snow, slush or ice (above South Dakota), plan winter equipment checks early.
- Check your own stops for crash hotspots and low bridges with the free Route Planner.
About the data
This report uses the FMCSA crash file (reported crashes of trucks over 10,000 lb) and NHTSA FARS (fatal crashes). It reports the numbers without guessing at reasons.
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 (in Lyman County) |
|---|---|
| I-90 | 2 |
| 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 |
Lyman County at a glance
| Population | 3,721 |
| Land area | 1,642.3 sq mi |
| Density | 2 per sq mi |
| Median household income (ZIP average) | $62,859 |
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 |
In the 1990s about 7 truck crashes a year were reported; in the 2020s, about 14. Reporting coverage also changed between these periods. Fatal crashes involving a large truck averaged 0.5 a year in 2016–19 and 0.4 a year in 2020–24.
Cities, towns & communities in Lyman County
ZIP codes in Lyman County
Nearby counties
Questions fleets ask about Lyman County
How many truck crashes happen in Lyman County?
Since 2015, 139 crashes involving commercial trucks were reported in Lyman County (25 injured, 14 killed).
When do most truck crashes happen in Lyman County?
Truck crashes in Lyman County peak in January, with 20.1% of the year's crashes.
How many garbage truck accidents happen in Lyman County?
Since 2015, Lyman County has reported 0 garbage-truck crashes, or 0.0% of its truck crashes.
What is the truck crash rate in Lyman County compared with South Dakota?
The yearly rate is 320.1 truck crashes per 100,000 residents in Lyman County, vs 42.0 for South Dakota.
How do I plan a garbage truck route in Lyman County?
The free Route Planner takes your stops and returns a route risk score, safer alternatives and low-bridge warnings.
2026 is a partial year. Updated October 2026.