Declo, ID truck route planning & crash data
Plan safer truck routes in Declo: commercial truck and garbage truck crashes in Declo and Cassia County, dangerous roads, seasonality and route safety data for fleets. Patterns use Cassia County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
4 of 462 truck crashes since 2015.
Deadliest roads
How Cassia County compares with Idaho
Cassia County against Idaho and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Cassia County stands out
Full comparison
| Measure (2015–2025) | Cassia County | Idaho | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 152.9 | 37.4 | 49.7 | 4.1× the state |
| Deaths per 100 crashes | 3.7 | 6.1 | 3.4 | 39% below the state |
| Injuries per crash | 0.65 | 0.55 | 0.49 | 1.2× the state |
| Garbage-truck share | 0.9% | 1.6% | 2.3% | 41% below the state |
| On snow, slush or ice | 23.3% | 16.0% | 6.2% | 1.5× the state |
| Morning rush (6–10 am) | 20.1% | 23.0% | 23.7% | 12% below the state |
| In rain, sleet or snow | 10.3% | 10.2% | 13.8% | same |
| Winter months (Nov–Mar) | 46.0% | 40.9% | 41.9% | 1.1× the state |
| After dark | 23.3% | 22.8% | 24.8% | same |
Cassia County has lower values than Idaho for deaths per 100 crashes, garbage-truck share and morning rush (6–10 am). It stands out for higher crashes per 100k residents / yr, injuries per crash and on snow, slush or ice.
The headline for Declo: I-84 most fatal truck crashes within 10 miles of Declo: 4 since 2015.
Overview
Since 2015, 462 crashes involving commercial trucks have been reported in Cassia County. They injured 293 people and killed 16.
In complete reporting years that works out to about one truck crash every 9 days.
With 190 truck crashes reported in Declo since 2015, this page uses Cassia County numbers for its patterns and comparisons.
When crashes happen
The worst month is March with 10.8% of truck crashes; the quietest is May at 6.1%.
Winter months (Nov–Mar) carry 46.0% of truck crashes, vs 40.9% for Idaho.
More truck crashes happen at 12–1 pm than at any other hour (8.2%).
23.3% of truck crashes here happened on snow, slush or ice, against 16.0% across Idaho.
Where crashes happen
I-84 leads within 10 miles of Declo with 4 fatal crashes involving a large truck since 2015. After it: SR-25 (2), 200 West Rd (1) and 400 South Rd (1).
Garbage & waste trucks
Garbage trucks account for 4 of the truck crashes here, or 0.9%, compared with 1.6% in Idaho.
Route planning tips for Declo fleets
- Plan March schedules with more margin; it is the worst month for truck crashes in Cassia County.
- Look at alternatives to I-84 at busy times: it leads this area in fatal truck crashes.
- Icy and snowy roads show up in 23.3% of truck crashes here, more than Idaho; 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 Cassia County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| I-84 | 4 |
| SR-25 | 2 |
| 200 West Rd | 1 |
| 400 South Rd | 1 |
| Bedke Blvd | 1 |
| SR-27 | 1 |
| SR-81 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Cassia County) |
|---|---|
| I-84 | 204 |
| US-30 | 30 |
| Sh 81 | 29 |
| I-86 | 26 |
| Sh 27 | 19 |
| South | 19 |
| Sh 77 | 18 |
| East | 13 |
Declo at a glance
| Population | 363 |
| Land area | 0.3 sq mi |
| Density | 1,310 per sq mi |
| Median household income (ZIP 83311) | $101,167 |
| Median home value (ZIP 83311) | $296,718 |
Waste facilities and haulers nearby
Historical data: truck crashes in Cassia 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 | 37 | — | 0.8 |
| 2000s | 42 | +14% | 0.8 |
| 2010s | 34 | -19% | 1.1 |
| 2020s | 37 | +8% | 1.2 |
In the 1990s about 37 truck crashes a year were reported; in the 2020s, about 37. Reporting coverage also changed between these periods. Fatal large-truck crashes: 1.2 a year in 2016–19, 1.2 a year in 2020–24.
Nearby places
Questions fleets ask about Declo
How many truck accidents are there in Declo?
Since 2015, 462 crashes involving commercial trucks were reported in Cassia County (293 injured, 16 killed).
Where do fatal truck crashes happen most in Declo?
NHTSA data shows I-84 with 4 fatal large-truck crashes within 10 miles of Declo since 2015, the highest of any road.
When do most truck crashes happen in Declo?
Truck crashes in Cassia County peak in March, with 10.8% of the year's crashes.
Are garbage truck crashes common in Declo?
Since 2015, Cassia County has reported 4 garbage-truck crashes, or 0.9% of its truck crashes.
How do truck crashes in Declo compare with Idaho?
Per 100,000 residents, Cassia County has 152.9 truck crashes a year; Idaho has 37.4.
What is the best way to plan truck routes in Declo?
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.