St. Marys, IA truck route planning & crash data
Plan safer truck routes in St. Marys: commercial truck and garbage truck crashes in St. Marys and Warren County, dangerous roads, seasonality and route safety data for fleets. Patterns use Warren County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
7 of 291 truck crashes since 2015.
Deadliest roads
How Warren County compares with Iowa
Warren County against Iowa and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Warren County stands out
Full comparison
| Measure (2015–2025) | Warren County | Iowa | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 43.7 | 68.1 | 49.7 | 36% below the state |
| Deaths per 100 crashes | 3.3 | 3.5 | 3.4 | same |
| Injuries per crash | 0.29 | 0.41 | 0.49 | 29% below the state |
| Garbage-truck share | 2.6% | 2.2% | 2.3% | 1.2× the state |
| On snow, slush or ice | 15.1% | 18.7% | 6.2% | 19% below the state |
| Morning rush (6–10 am) | 17.0% | 24.0% | 23.7% | 29% below the state |
| In rain, sleet or snow | 14.8% | 15.1% | 13.8% | same |
| Winter months (Nov–Mar) | 39.9% | 45.4% | 41.9% | 12% below the state |
| After dark | 26.9% | 23.1% | 24.8% | 1.2× the state |
Compared with Iowa, Warren County is lower on crashes per 100k residents / yr, injuries per crash and on snow, slush or ice. It runs above Iowa on garbage-truck share and after dark.
What stands out in Warren County: August 11.3% of truck crashes happen in August, more than any other month.
Overview
Police reported 291 crashes involving commercial trucks in Warren County since 2015: 82 people were injured and 9 were killed.
That averages about one truck crash every 15 days in fully reported years.
With 1 truck crash reported in St. Marys since 2015, this page uses Warren County numbers for its patterns and comparisons.
62% of truck crash reports in Warren County since 2015 leave the city field blank; place counts include only reports that name the place.
When crashes happen
Truck crashes peak in August (11.3% of the year) and are lowest in December (5.2%).
Winter months (Nov–Mar) carry 39.9% of truck crashes, vs 45.4% for Iowa.
More truck crashes happen at 3–4 pm than at any other hour (10.3%).
Road surface: 15.1% of truck crashes were on snow, slush or ice (Iowa: 18.7%).
Where crashes happen
Since 2015, fatal crashes with a large truck within 10 miles of St. Marys happened on I-35 (1), Ts-Upland Ave (1), US-65 (1) and US-69 (1); no road leads clearly.
Garbage & waste trucks
7 crashes involved a garbage or refuse truck, a 2.4% share (Iowa: 2.2%).
Route planning tips for St. Marys fleets
- Build extra time into August routes: it has the most truck crashes here.
- Paste your stops into the free Route Planner to see the risk score, safer alternatives and low bridges.
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 Warren County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| I-35 | 1 |
| Ts-Upland Ave | 1 |
| US-65 | 1 |
| US-69 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Warren County) |
|---|---|
| I-35 | 9 |
| Ia 5 | 8 |
| US-65 | 8 |
| Blk. N. Jefferson Way | 7 |
| Blk N Jefferson Way | 6 |
| Blk. W. Second Ave. | 5 |
| State 92/Iowa 92 | 4 |
| State 5/Iowa 5 And G016/Scotch | 3 |
St. Marys at a glance
| Population | 116 |
| Land area | 0.1 sq mi |
| Density | 823 per sq mi |
| Median household income (ZIP 50241) | $77,500 |
| Median home value (ZIP 50241) | $187,133 |
Waste facilities and haulers nearby
Historical data: truck crashes in Warren 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 | 6 | — | 0.5 |
| 2000s | 19 | +231% | 0.7 |
| 2010s | 23 | +16% | 1.3 |
| 2020s | 26 | +16% | 0.4 |
Reported truck crashes averaged 6 a year in the 1990s and 26 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 1.5 a year in 2016–19 and 0.4 a year in 2020–24.
Nearby places
Questions fleets ask about St. Marys
How many truck crashes happen in St. Marys?
Since 2015, 291 crashes involving commercial trucks were reported in Warren County (82 injured, 9 killed).
What is the worst month for truck crashes in St. Marys?
Truck crashes in Warren County peak in August, with 11.3% of the year's crashes.
How many garbage truck crashes are there in St. Marys?
Since 2015, Warren County has reported 7 garbage-truck crashes, or 2.4% of its truck crashes.
How do truck crashes in St. Marys compare with Iowa?
The yearly rate is 43.7 truck crashes per 100,000 residents in Warren County, vs 68.1 for Iowa.
What is the best way to plan truck routes in St. Marys?
Paste your stops into the free CurbWaste Route Planner: it scores your route against fatal-crash locations, suggests safer alternatives and flags low bridges.
2026 is a partial year. Updated October 2026.