Lewis and Clark County, MT truck route planning & crash data
Plan safer truck routes in Lewis and Clark 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
2 of 228 truck crashes since 2015.
Deadliest roads
How Lewis and Clark County compares with Montana
Lewis and Clark County against Montana and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Lewis and Clark County stands out
Full comparison
| Measure (2015–2025) | Lewis and Clark County | Montana | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 24.9 | 64.3 | 49.7 | 61% below the state |
| Deaths per 100 crashes | 5.3 | 3.8 | 3.4 | 1.4× the state |
| Injuries per crash | 0.29 | 0.34 | 0.49 | 15% below the state |
| Garbage-truck share | 1.0% | 0.9% | 2.3% | same |
| On snow, slush or ice | 34.5% | 39.4% | 6.2% | 12% below the state |
| Morning rush (6–10 am) | 20.9% | 22.9% | 23.7% | 9% below the state |
| In rain, sleet or snow | 24.3% | 20.6% | 13.8% | 1.2× the state |
| Winter months (Nov–Mar) | 45.6% | 54.3% | 41.9% | 16% below the state |
| After dark | 20.9% | 30.8% | 24.8% | 32% below the state |
Compared with Montana, Lewis and Clark County is lower on crashes per 100k residents / yr, injuries per crash and on snow, slush or ice. It stands out for higher deaths per 100 crashes and in rain, sleet or snow.
Lewis and Clark County at a glance: US-12 most fatal truck crashes in Lewis and Clark County: 3 since 2015.
Overview
Lewis and Clark County has recorded 228 truck crashes since 2015, with 69 people injured and 12 killed.
That averages about one truck crash every 19 days in fully reported years.
When crashes happen
The worst month is October with 13.2% of truck crashes; the quietest is May at 3.9%.
November through March accounts for 45.6% of truck crashes here, compared with 54.3% in Montana.
The busiest hour is 1–2 pm, with 9.6% of truck crashes.
34.5% of truck crashes here happened on snow, slush or ice, against 39.4% across Montana.
Where crashes happen
Within this area, US-12 had the most fatal crashes involving a large truck since 2015 (3). After it: Sr-Mt 200 (2), Canyon Ferry Rd (1) and I-15 (1).
Garbage & waste trucks
Garbage trucks account for 2 of the truck crashes here, or 0.9%, compared with 0.9% in Montana.
Route planning tips for Lewis and Clark County fleets
- Build extra time into October routes: it has the most truck crashes here.
- Where you can, review stops along US-12; it has the most fatal large-truck crashes nearby.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
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 Lewis and Clark County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (in Lewis and Clark County) |
|---|---|
| US-12 | 3 |
| Sr-Mt 200 | 2 |
| Canyon Ferry Rd | 1 |
| I-15 | 1 |
| N Rodney St | 1 |
| Sr-Green Meadow Dr | 1 |
| Ssr-453 Lincoln Rd | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Lewis and Clark County) |
|---|---|
| Mm 221.5 I-15 | 4 |
| Mm 213.0 I-15 | 3 |
| Mm221.6 I-15 | 2 |
| Canyon Ferry Rd\Custer Ave | 1 |
| E Us Highway 12 And Lola St | 1 |
| Mm 108.2 Mt Highway 200 | 1 |
| Mm 213.1 I-15 | 1 |
| Mm 213.1 I15 | 1 |
Lewis and Clark County at a glance
| Population | 75,129 |
| Land area | 3,458.4 sq mi |
| Density | 22 per sq mi |
| Median household income (ZIP average) | $81,913 |
Waste facilities and haulers nearby
Historical data: truck crashes in Lewis and Clark 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 | — | — | 0.5 |
| 2000s | 18 | — | 0.5 |
| 2010s | 18 | +1% | 0.5 |
| 2020s | 18 | +0% | 1.2 |
In the 2000s about 18 truck crashes a year were reported; in the 2020s, about 18. Reporting coverage also changed between these periods. NHTSA counts 0.8 fatal large-truck crashes a year in 2016–19 and 1.2 a year in 2020–24.
Cities, towns & communities in Lewis and Clark County
ZIP codes in Lewis and Clark County
Nearby counties
Questions fleets ask about Lewis and Clark County
How many truck accidents are there in Lewis and Clark County?
Since 2015, 228 crashes involving commercial trucks were reported in Lewis and Clark County (69 injured, 12 killed).
Where do fatal truck crashes happen most in Lewis and Clark County?
Since 2015, US-12 has had the most fatal large-truck crashes in Lewis and Clark County: 3.
When do most truck crashes happen in Lewis and Clark County?
Truck crashes in Lewis and Clark County peak in October, with 13.2% of the year's crashes.
Are garbage truck crashes common in Lewis and Clark County?
2 crashes involving garbage or refuse trucks have been reported in Lewis and Clark County since 2015, 0.9% of all truck crashes.
How do truck crashes in Lewis and Clark County compare with Montana?
Per 100,000 residents, Lewis and Clark County has 24.9 truck crashes a year; Montana has 64.3.
What is the best way to plan truck routes in Lewis and Clark County?
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.