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US Route 91
Fatal crashes 2015–2024 30Deaths 35Counties 4Latest 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.
US Route 91 in Idaho was the trafficway in 30 fatal crashes between 2015 and 2024, in which 35 people died.
That is 1.4% of the 2,159 fatal crashes in Idaho over the same years. The ten-year crash count rose 50% from 20 in 2005–2014 to 30 in 2015–2024.
The crashes were concentrated in Bannock County (9), Franklin County (9) and Bingham County (8) and 1 other county.
33.3% of the crashes had a driver reported as drinking (Idaho: 31.2%) and 26.7% had a speeding-related driver (22.4%); pedestrians were 2.9% and motorcyclists 11.4% 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 | US Route 91 | Idaho |
|---|---|---|
| Fatal crashes, 2015–2024 | 30 | 2,159 |
| Deaths, 2015–2024 | 35 | 2,387 |
| Deaths per fatal crash | 1.2 | 1.1 |
| Share of state fatal crashes | 1.4% | 100% |
| Change vs previous ten years | +50% | +8% |
Factor shares
Counties along the route
| # | County | Fatal crashes on US-91 | Share of route | County total, all roads |
|---|---|---|---|---|
| 1 | Bannock County | 9 | 30% | 84 |
| 2 | Franklin County | 9 | 30% | 20 |
| 3 | Bingham County | 8 | 27% | 85 |
| 4 | Bonneville County | 4 | 13% | 116 |
Hour of day
Share of fatal crashes on US Route 91 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 0–5 | 4 | 13% |
| Mile 10–15 | 3 | 10% |
| Mile 80–85 | 3 | 10% |
| Mile 20–25 | 2 | 7% |
| Mile 85–90 | 2 | 7% |
| Mile 95–100 | 2 | 7% |
Five-mile bins by FARS milepoint, the six with the most fatal crashes; 80% 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
- State Route 55 65
- US Route 93 60
- US Route 30 53
- US Route 12 41
- US Route 26 40
- Interstate 90 38
- 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 US Route 91 in Idaho?
30 fatal crashes with 35 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 US Route 91 had the most fatal crashes?
Bannock County (9), Franklin County (9), Bingham County (8) and Bonneville County (4).
What share of crashes on US Route 91 involved alcohol or speeding?
33.3% had a driver reported as drinking and 26.7% a speeding-related driver, against 31.2% and 22.4% for all fatal crashes in Idaho.
When do fatal crashes happen on US Route 91?
43.3% 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.