States › Idaho › Routes › State Route 55
State Route 55
Fatal crashes 2015–2024 65Deaths 70Counties 5Latest data year 2024
FARS data are based on police crash reports and other sources; the drunk-driving measure is based on the highest BAC of any driver in the crash. Latest data year: 2024. The route is the trafficway recorded for each crash (FARS TWAY_ID); the same route number in another state has its own page.
Between 2015 and 2024, FARS records 65 fatal crashes on State Route 55 in Idaho, with 70 deaths.
That is 3% of the 2,159 fatal crashes in Idaho over the same years. The ten-year crash count rose 20% from 54 in 2005–2014 to 65 in 2015–2024.
The crashes were concentrated in Canyon County (19), Boise County (18) and Valley County (16) and 2 other counties.
16.9% of the crashes had a driver reported as drinking (Idaho: 31.2%) and 12.3% had a speeding-related driver (22.4%); pedestrians were 8.6% and motorcyclists 10.0% of those killed.
Fatal crashes per year
Route identification in FARS is consistent from 2000; earlier years are not shown. Shaded band: the ten-year window used for the shares below.
Compared with all fatal crashes in Idaho
| Measure | State Route 55 | Idaho |
|---|---|---|
| Fatal crashes, 2015–2024 | 65 | 2,159 |
| Deaths, 2015–2024 | 70 | 2,387 |
| Deaths per fatal crash | 1.1 | 1.1 |
| Share of state fatal crashes | 3% | 100% |
| Change vs previous ten years | +20% | +8% |
Factor shares
Counties along the route
| # | County | Fatal crashes on SR-55 | Share of route | County total, all roads |
|---|---|---|---|---|
| 1 | Canyon County | 19 | 29% | 227 |
| 2 | Boise County | 18 | 28% | 58 |
| 3 | Valley County | 16 | 25% | 30 |
| 4 | Ada County | 10 | 15% | 240 |
| 5 | Adams County | 2 | 3% | 20 |
Hour of day
Share of fatal crashes on State Route 55 beginning in each hour, 2015–2024; tick marks the Idaho share for all roads.
Where along the route
| Mile marker range | Fatal crashes | Share |
|---|---|---|
| Mile 10–15 | 5 | 8% |
| Mile 5–10 | 4 | 6% |
| Mile 70–75 | 4 | 6% |
| Mile 75–80 | 4 | 6% |
| Mile 65–70 | 3 | 5% |
| Mile 80–85 | 3 | 5% |
Five-mile bins by FARS milepoint, the six with the most fatal crashes; 73.8% of crashes on the route have a milepoint. Milepoints are as recorded by the state and can restart at county or district lines.
Other routes in Idaho
- Interstate 84 200
- US Route 95 179
- US Route 20 100
- Interstate 15 87
- US Route 93 60
- US Route 30 53
- US Route 12 41
- US Route 26 40
- Interstate 90 38
- US Route 91 30
- State Route 75 29
- State Route 21 27
All routes and counties in Idaho
Questions and answers
How many fatal crashes have there been on State Route 55 in Idaho?
65 fatal crashes with 70 deaths over 2015–2024, per NHTSA's FARS. The route is the trafficway recorded for the crash; the same numbered route in another state has its own page.
Which counties along State Route 55 had the most fatal crashes?
Canyon County (19), Boise County (18), Valley County (16), Ada County (10) and Adams County (2).
What share of crashes on State Route 55 involved alcohol or speeding?
16.9% had a driver reported as drinking and 12.3% a speeding-related driver, against 31.2% and 22.4% for all fatal crashes in Idaho.
When do fatal crashes happen on State Route 55?
30.8% of the crashes were between 6pm and 6am. The hour chart on this page shows the full distribution.
Provenance
Source: NHTSA Fatality Analysis Reporting System, annual national CSV files 2000–2024 (accident, vehicle and person tables), public domain. Route pages are built for signed Interstate, US and state routes with at least 20 fatal crashes in 2015–2024. Data through 31 Dec 2024; generated 30 Sep 2026. See methodology and corrections.