Mariposa County, CA truck route planning & crash data
Plan safer truck routes in Mariposa 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
3 of 55 truck crashes since 2015.
Deadliest roads
How Mariposa County compares with California
Mariposa County against California and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Mariposa County stands out
Full comparison
| Measure (2015–2025) | Mariposa County | California | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 26.7 | 33.2 | 49.7 | 20% below the state |
| Deaths per 100 crashes | 6.0 | 3.6 | 3.4 | 1.7× the state |
| Injuries per crash | 0.50 | 0.44 | 0.49 | 1.1× the state |
| Garbage-truck share | 6.0% | 1.6% | 2.3% | 3.7× the state |
| On snow, slush or ice | 6.0% | 0.9% | 6.2% | 6.5× the state |
| Morning rush (6–10 am) | 38.0% | 23.5% | 23.7% | 1.6× the state |
| In rain, sleet or snow | 6.0% | 6.5% | 13.8% | 8% below the state |
| Winter months (Nov–Mar) | 36.0% | 40.2% | 41.9% | 11% below the state |
| After dark | 16.0% | 29.1% | 24.8% | 45% below the state |
Compared with California, Mariposa County is lower on crashes per 100k residents / yr, in rain, sleet or snow and winter months (nov–mar). It stands out for higher deaths per 100 crashes, injuries per crash and garbage-truck share.
What stands out in Mariposa County: 6.0% share of truck crashes on snow, slush or ice (California: 0.9%).
Overview
Police reported 55 crashes involving commercial trucks in Mariposa County since 2015: 29 people were injured and 3 were killed.
That averages about one truck crash every 80 days in fully reported years.
When crashes happen
The worst month is July with 14.5% of truck crashes; the quietest is February at 0.0%.
The five winter months (November to March) hold 36.0% of truck crashes, against 40.2% across California.
By time of day, 9–10 am stands out with 18.2% of truck crashes.
Road surface: 6.0% of truck crashes were on snow, slush or ice (California: 0.9%).
Where crashes happen
Since 2015, fatal crashes with a large truck in Mariposa County happened on SR-140 (3) and SR-49 (1); no road leads clearly.
Garbage & waste trucks
3 crashes involved a garbage or refuse truck, a 5.5% share (California: 1.6%).
Route planning tips for Mariposa County fleets
- Review driver schedules for July, the month with the most truck crashes.
- Morning starts matter: 38.0% of truck crashes fall between 6 and 10 am, higher than California.
- 6.0% of truck crashes were on snow, slush or ice, above California; plan winter equipment checks before the season.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
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 Mariposa County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (in Mariposa County) |
|---|---|
| SR-140 | 3 |
| SR-49 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Mariposa County) |
|---|---|
| SR-140 | 3 |
| Rt49/255Ft S Of Stumpfield Mountain Rd | 2 |
| SR-49 | 2 |
| Bear Valley Rd/78Ft W Hunters Valley Rd | 1 |
| Greeley Hill Rd | 1 |
| Highway 140/450Ft W Martin Rd | 1 |
| Horseshoe Bend Rd/600Ft N Sr132 | 1 |
| Jerseydale Rd/.7M S Wild Dove Ln | 1 |
Mariposa County at a glance
| Population | 17,048 |
| Land area | 1,448.8 sq mi |
| Density | 12 per sq mi |
| Median household income (ZIP average) | $64,196 |
Waste facilities and haulers nearby
Historical data: truck crashes in Mariposa 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 | — | — | 0.2 |
| 2000s | 5 | — | 0.1 |
| 2010s | 3 | -34% | 0.5 |
| 2020s | 5 | +52% | 0.2 |
From the 2000s to the 2020s, yearly reported truck crashes went from 5 to 5. Some of the change may reflect how crashes were reported. NHTSA counts 0.8 fatal large-truck crashes a year in 2016–19 and 0.2 a year in 2020–24.
Cities, towns & communities in Mariposa County
ZIP codes in Mariposa County
Nearby counties
Questions fleets ask about Mariposa County
How many truck accidents are there in Mariposa County?
55 truck crashes have been reported in Mariposa County since 2015, with 3 deaths and 29 injuries.
When do most truck crashes happen in Mariposa County?
The worst month is July: 14.5% of truck crashes in Mariposa County happen then.
Are garbage truck crashes common in Mariposa County?
Since 2015, Mariposa County has reported 3 garbage-truck crashes, or 5.5% of its truck crashes.
What is the truck crash rate in Mariposa County compared with California?
Per 100,000 residents, Mariposa County has 26.7 truck crashes a year; California has 33.2.
How can I plan a safer truck route in Mariposa 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.