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Interstate 15
Fatal crashes 2015–2024 271Deaths 313Counties 10Latest 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 271 fatal crashes on Interstate 15 in Utah, with 313 deaths.
That is 10.5% of the 2,577 fatal crashes in Utah over the same years. The ten-year crash count fell 19% from 335 in 2005–2014 to 271 in 2015–2024.
The crashes were concentrated in Salt Lake County (49), Utah County (44) and Box Elder County (31) and 7 other counties.
17.7% of the crashes had a driver reported as drinking (Utah: 22.7%) and 32.5% had a speeding-related driver (28.5%); pedestrians were 9.3% and motorcyclists 7.0% 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 Utah
| Measure | Interstate 15 | Utah |
|---|---|---|
| Fatal crashes, 2015–2024 | 271 | 2,577 |
| Deaths, 2015–2024 | 313 | 2,824 |
| Deaths per fatal crash | 1.2 | 1.1 |
| Share of state fatal crashes | 10.5% | 100% |
| Change vs previous ten years | -19% | +14% |
Factor shares
Counties along the route
| # | County | Fatal crashes on I-15 | Share of route | County total, all roads |
|---|---|---|---|---|
| 1 | Salt Lake County | 49 | 18% | 700 |
| 2 | Utah County | 44 | 16% | 313 |
| 3 | Box Elder County | 31 | 11% | 96 |
| 4 | Iron County | 28 | 10% | 63 |
| 5 | Millard County | 27 | 10% | 54 |
| 6 | Davis County | 26 | 10% | 138 |
| 7 | Juab County | 21 | 8% | 40 |
| 8 | Weber County | 21 | 8% | 207 |
| 9 | Washington County | 15 | 6% | 142 |
| 10 | Beaver County | 9 | 3% | 22 |
Hour of day
Share of fatal crashes on Interstate 15 beginning in each hour, 2015–2024; tick marks the Utah share for all roads.
Where along the route
| Mile marker range | Fatal crashes | Share |
|---|---|---|
| Mile 270–275 | 11 | 4% |
| Mile 300–305 | 10 | 4% |
| Mile 305–310 | 10 | 4% |
| Mile 335–340 | 10 | 4% |
| Mile 310–315 | 9 | 3% |
| Mile 340–345 | 9 | 3% |
Five-mile bins by FARS milepoint, the six with the most fatal crashes; 97.4% 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 Utah
- US Route 89 185
- Interstate 80 89
- State Route 68 74
- Interstate 70 67
- US Route 6 67
- US Route 40 61
- US Route 191 40
- Interstate 215 34
- State Route 126 34
- State Route 201 29
- Interstate 84 28
- State Route 171 27
All routes and counties in Utah
Questions and answers
How many fatal crashes have there been on Interstate 15 in Utah?
271 fatal crashes with 313 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 Interstate 15 had the most fatal crashes?
Salt Lake County (49), Utah County (44), Box Elder County (31), Iron County (28) and Millard County (27).
What share of crashes on Interstate 15 involved alcohol or speeding?
17.7% had a driver reported as drinking and 32.5% a speeding-related driver, against 22.7% and 28.5% for all fatal crashes in Utah.
When do fatal crashes happen on Interstate 15?
47.4% 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.