The deadliest roads in Idaho
I-84 had the most fatal crashes of any numbered road in Idaho from 2015 to 2024: 187, with 204 deaths. Over 2022 to 2024 alone, US 95 had the most, 50 against 46 on I-84. The 41 roads listed held 55% of all fatal crashes in Idaho from 2015 to 2024; 4 are interstates, 9 US routes, 28 state highways.
66 numbered roads in Idaho recorded a fatal crash in those years; the 41 with 5 or more are ranked below, and 8 have a page of their own. All fatal crashes in Idaho.
Every numbered road in Idaho, ranked by fatal crashes
| Road | Kind | Fatal crashes | Deaths | 2022 to 2024 | Counties with the most | |
|---|---|---|---|---|---|---|
| 1 | I-84 | Interstate | 187 | 204 | 46 | Elmore, Ada, Jerome |
| 2 | US 95 | US route | 178 | 206 | 50 | Kootenai, Idaho, Nez Perce |
| 3 | US 20 | US route | 102 | 119 | 39 | Canyon, Fremont, Ada |
| 4 | I-15 | Interstate | 86 | 95 | 19 | Bannock, Bingham, Bonneville |
| 5 | State Highway 55 | State highway | 66 | 71 | 19 | Canyon, Boise, Valley |
| 6 | US 93 | US route | 60 | 66 | 19 | Twin Falls, Jerome, Lemhi |
| 7 | US 30 | US route | 53 | 64 | 15 | Twin Falls, Bannock, Cassia |
| 8 | US 26 | US route | 41 | 45 | 8 | Bonneville, Bingham, Lincoln |
| 9 | US 12 | US route | 40 | 41 | 16 | Idaho, Nez Perce, Clearwater |
| 10 | I-90 | Interstate | 31 | 33 | 6 | Kootenai, Shoshone |
| 11 | US 91 | US route | 30 | 35 | 12 | Bannock, Franklin, Bingham |
| 12 | State Highway 75 | State highway | 29 | 35 | 6 | Blaine, Custer, Lincoln |
| 13 | State Highway 21 | State highway | 27 | 29 | 9 | Boise, Ada, Custer |
| 14 | State Highway 33 | State highway | 22 | 26 | 11 | Teton, Jefferson, Madison |
| 15 | I-86 | Interstate | 16 | 17 | 10 | Power, Cassia, Bannock |
| 16 | State Highway 16 | State highway | 16 | 17 | 5 | Gem, Ada |
| 17 | State Highway 39 | State highway | 15 | 17 | 5 | Bingham, Power |
| 18 | State Highway 44 | State highway | 15 | 16 | 5 | Ada, Canyon |
| 19 | State Highway 53 | State highway | 13 | 14 | 3 | Kootenai |
| 20 | State Highway 25 | State highway | 12 | 15 | 6 | Jerome, Minidoka |
| 21 | State Highway 41 | State highway | 12 | 14 | 8 | Kootenai, Bonner |
| 22 | State Highway 3 | State highway | 12 | 12 | 3 | Kootenai, Latah, Benewah |
| 23 | State Highway 52 | State highway | 11 | 14 | 4 | Gem, Payette |
| 24 | State Highway 51 | State highway | 11 | 13 | 4 | Elmore, Owyhee |
| 25 | State Highway 78 | State highway | 11 | 11 | 4 | Owyhee |
| 26 | State Highway 81 | State highway | 9 | 12 | 5 | Cassia |
| 27 | State Highway 46 | State highway | 9 | 10 | 1 | Gooding |
| 28 | State Highway 13 | State highway | 7 | 8 | 1 | Idaho |
| 29 | State Highway 34 | State highway | 7 | 8 | 1 | Caribou, Franklin |
| 30 | US 89 | US route | 7 | 8 | 2 | Bear Lake |
| 31 | State Highway 19 | State highway | 7 | 7 | 0 | Canyon, Owyhee |
| 32 | State Highway 24 | State highway | 7 | 7 | 1 | Lincoln |
| 33 | State Highway 200 | State highway | 6 | 8 | 1 | Bonner |
| 34 | State Highway 57 | State highway | 6 | 7 | 2 | Bonner |
| 35 | State Highway 69 | State highway | 6 | 7 | 2 | Ada |
| 36 | State Highway 50 | State highway | 6 | 6 | 3 | Twin Falls |
| 37 | State Highway 27 | State highway | 5 | 7 | 0 | Cassia, Minidoka |
| 38 | State Highway 5 | State highway | 5 | 6 | 3 | Benewah |
| 39 | State Highway 6 | State highway | 5 | 5 | 3 | Latah, Benewah |
| 40 | State Highway 8 | State highway | 5 | 5 | 0 | Latah |
| 41 | US 2 | US route | 5 | 5 | 1 | Bonner |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Download every numbered road in Idaho as CSV. Free to reuse with credit: “Fatal Crash Data, fatalcrashdata.com/deadliest-roads/idaho/, from NHTSA FARS (2024 Annual Report File).”
Interstates in Idaho per mile
Fatal crashes a year per 100 miles of road, 2015 to 2024, for interstates with 20 miles or more in Idaho. Crashes per mile of road, not per vehicle. Mileage from the FHWA Interstate route log.
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Questions about the deadliest roads in Idaho
- What is the deadliest road in Idaho?
- I-84 had the most fatal crashes of any numbered road in Idaho from 2015 to 2024: 187, with 204 deaths. US 95 was second with 178 and US 20 third with 102. Source: NHTSA's Fatality Analysis Reporting System (FARS).
- Which interstate in Idaho is the most dangerous per mile?
- I-84, with 6.8 fatal crashes a year per 100 miles over 2015 to 2024 on 276 miles. That is crashes per mile of road, not per vehicle.
- How many fatal crashes in Idaho happen on numbered roads?
- 1,255 of 2,159 fatal crashes in Idaho from 2015 to 2024 (58%) were filed on an interstate, US or state route; the rest were on county roads, city streets and unnamed roads, which are in the state's total but not ranked here.
Where the Idaho road numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash filed on a numbered interstate, US or state route in Idaho, read from the road name NHTSA filed, with ramps, frontage and service roads left out. A road gets its own page with 15 or more fatal crashes from 2022 to 2024. The full method.