Irwin, SD truck route planning & crash data
Plan safer truck routes in Irwin: commercial truck and garbage truck crashes in Irwin and Tripp County, dangerous roads, seasonality and route safety data for fleets. Patterns use Tripp County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
1 of 34 truck crashes since 2015.
Deadliest roads
How Tripp County compares with South Dakota
Tripp County against South Dakota and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Tripp County stands out
Full comparison
| Measure (2015–2025) | Tripp County | South Dakota | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 50.9 | 42.0 | 49.7 | 1.2× the state |
| Deaths per 100 crashes | 3.1 | 5.2 | 3.4 | 40% below the state |
| Injuries per crash | 0.28 | 0.13 | 0.49 | 2.2× the state |
| Garbage-truck share | 3.1% | 1.6% | 2.3% | 1.9× the state |
| On snow, slush or ice | 18.8% | 28.6% | 6.2% | 35% below the state |
| Morning rush (6–10 am) | 12.5% | 22.2% | 23.7% | 44% below the state |
| In rain, sleet or snow | 12.5% | 17.5% | 13.8% | 29% below the state |
| Winter months (Nov–Mar) | 40.6% | 48.8% | 41.9% | 17% below the state |
| After dark | 18.8% | 22.8% | 24.8% | 18% below the state |
Compared with South Dakota, Tripp County is lower on deaths per 100 crashes, on snow, slush or ice and morning rush (6–10 am). It runs above South Dakota on crashes per 100k residents / yr, injuries per crash and garbage-truck share.
What stands out in Tripp County: October 23.5% of truck crashes happen in October, more than any other month.
Overview
Tripp County has recorded 34 truck crashes since 2015, with 10 people injured and 1 killed.
That averages about one truck crash every 125 days in fully reported years.
Only 0 truck crashes were reported in Irwin since 2015; patterns below come from Tripp County as a whole.
When crashes happen
Truck crashes peak in October (23.5% of the year) and are lowest in February (0.0%).
November through March accounts for 40.6% of truck crashes here, compared with 48.8% in South Dakota.
By time of day, 12–1 pm stands out with 11.8% of truck crashes.
Snow, slush or ice was on the road in 18.8% of truck crashes, compared with 28.6% in South Dakota.
Where crashes happen
Fatal large-truck crashes within 10 miles of Irwin since 2015 were spread across roads: US-18 (1).
Garbage & waste trucks
Garbage and refuse trucks were involved in 1 crash, 2.9% of the total, against 1.6% across South Dakota.
Route planning tips for Irwin fleets
- Review driver schedules for October, the month with the most truck crashes.
- 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 Tripp County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| US-18 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Tripp County) |
|---|---|
| Sd Hwy 44 | 8 |
| US-18 | 7 |
| Sd Hwy 49 | 4 |
| Ave | 2 |
| US-183 | 2 |
| SR-18 | 1 |
| Sd Hwy 53 | 1 |
| Us 18 Ef | 1 |
Irwin at a glance
| Population | 22 |
| Land area | 35.7 sq mi |
| Density | 1 per sq mi |
| Median household income (ZIP 57529) | $75,313 |
| Median home value (ZIP 57529) | $291,551 |
Waste facilities and haulers nearby
Historical data: truck crashes in Tripp 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 | 3 | — | 0.0 |
| 2000s | 3 | -20% | 0.3 |
| 2010s | 2 | -12% | 0.1 |
| 2020s | 3 | +45% | 0.6 |
Reported truck crashes averaged 3 a year in the 1990s and 3 a year in the 2020s. Reporting practices changed over time, so part of any change can come from reporting. Fatal large-truck crashes: 0.0 a year in 2016–19, 0.6 a year in 2020–24.
Nearby places
Questions fleets ask about Irwin
How common are truck crashes in Irwin?
Tripp County has had 34 reported truck crashes since 2015, injuring 10 people and killing 1.
What is the worst month for truck crashes in Irwin?
October has the most truck crashes in Tripp County, 23.5% of the yearly total.
How many garbage truck accidents happen in Irwin?
Garbage trucks were involved in 1 reported crash in Tripp County since 2015 (2.9% of truck crashes).
What is the truck crash rate in Irwin compared with South Dakota?
Per 100,000 residents, Tripp County has 50.9 truck crashes a year; South Dakota has 42.0.
What is the best way to plan truck routes in Irwin?
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.