Oacoma Township, SD truck route planning & crash data
Plan safer truck routes in Oacoma Township: commercial truck and garbage truck crashes in Oacoma Township 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
No fatal large-truck crashes with a road name recorded here since 2015.
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 runs above South Dakota on crashes per 100k residents / yr, on snow, slush or ice and in rain, sleet or snow.
The headline for Lyman County: January 20.1% of truck crashes happen in January, more than any other month.
Overview
Police reported 139 crashes involving commercial trucks in Lyman County since 2015: 25 people were injured and 14 were killed.
That averages about one truck crash every 31 days in fully reported years.
Oacoma Township had 0 reported truck crashes since 2015, too few for reliable patterns, so the charts and findings on this page use Lyman County numbers.
When crashes happen
The worst month is January with 20.1% of truck crashes; the quietest is February at 3.6%.
November through March accounts for 55.7% of truck crashes here, compared with 48.8% in South Dakota.
By time of day, 8–9 am stands out with 7.9% of truck crashes.
Snow, slush or ice was on the road in 40.5% of truck crashes, compared with 28.6% in South Dakota.
Where crashes happen
Since 2015, no fatal large-truck crashes with a location were recorded within 10 miles of Oacoma.
Garbage & waste trucks
FMCSA lists no garbage-truck crashes in Lyman County since 2015.
Route planning tips for Oacoma Township 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.
- Paste your stops into the free Route Planner to see the risk score, safer alternatives and low bridges.
About the data
Crash counts come from the FMCSA crash file (police-reported crashes involving trucks over 10,000 lb); fatal-crash locations come from NHTSA FARS. Text on this page states only what these numbers show.
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
No fatal crashes involving a large truck with a road name were recorded within 10 miles since 2015.
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 |
Oacoma Township at a glance
| Population | 81 |
| Land area | 59.8 sq mi |
| Density | 1 per sq mi |
| Median household income (ZIP 57365) | $76,000 |
| Median home value (ZIP 57365) | $239,536 |
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 |
From the 1990s to the 2020s, yearly reported truck crashes went from 7 to 14. Some of the change may reflect how crashes were reported. NHTSA counts 0.5 fatal large-truck crashes a year in 2016–19 and 0.4 a year in 2020–24.
Nearby places
Questions fleets ask about Oacoma Township
How common are truck crashes in Oacoma Township?
139 truck crashes have been reported in Lyman County since 2015, with 14 deaths and 25 injuries.
Which month has the most truck crashes in Oacoma Township?
January has the most truck crashes in Lyman County, 20.1% of the yearly total.
How many garbage truck crashes are there in Oacoma Township?
Since 2015, Lyman County has reported 0 garbage-truck crashes, or 0.0% of its truck crashes.
How do truck crashes in Oacoma Township compare with South Dakota?
Lyman County records 320.1 truck crashes per 100,000 residents a year, against 42.0 across South Dakota.
How can I plan a safer truck route in Oacoma Township?
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.