I-90 in South Dakota: fatal crashes
From 2015 to 2024, 107 fatal crashes on I-90 in South Dakota killed 122 people, the most of any numbered road in South Dakota. In 2024 there were 13 fatal crashes and 14 deaths on the road.
An interstate running through 12 counties of South Dakota. All fatal crashes in South Dakota.
Deaths on I-90 in South Dakota by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2015 | 15 | 18 |
| 2016 | 7 | 8 |
| 2017 | 8 | 10 |
| 2018 | 10 | 11 |
| 2019 | 5 | 5 |
| 2020 | 8 | 10 |
| 2021 | 12 | 13 |
| 2022 | 9 | 10 |
| 2023 | 20 | 23 |
| 2024 | 13 | 14 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Where on I-90 in South Dakota: the counties with the most fatal crashes
Pennington County had the most fatal crashes on I-90 from 2015 to 2024: 21, with 21 deaths. Counties are listed from 5 fatal crashes.
| County | 2024 | 2015 to 2024 | Deaths | |
|---|---|---|---|---|
| 1 | Pennington | 2 | 21 | 21 |
| 2 | Minnehaha | 2 | 13 | 17 |
| 3 | Meade | 2 | 13 | 13 |
| 4 | Lawrence | 0 | 12 | 14 |
| 5 | Jones | 0 | 9 | 10 |
| 6 | Jackson | 3 | 9 | 9 |
| 7 | Hanson | 1 | 7 | 11 |
| 8 | Aurora | 0 | 7 | 10 |
| 9 | Lyman | 1 | 6 | 7 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
When fatal crashes happen on I-90 in South Dakota
Too few crashes to name a heaviest slot. The grid shows the shares; a share is only given over 20 crashes.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 0.9 percent, 1 fatal crashes | 1.9 percent, 2 fatal crashes | 4.7 percent, 5 fatal crashes | 2.8 percent, 3 fatal crashes | 2.8 percent, 3 fatal crashes | 1.9 percent, 2 fatal crashes |
| Mon | 1.9 percent, 2 fatal crashes | 2.8 percent, 3 fatal crashes | 1.9 percent, 2 fatal crashes | 1.9 percent, 2 fatal crashes | 2.8 percent, 3 fatal crashes | 1.9 percent, 2 fatal crashes |
| Tue | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 1.9 percent, 2 fatal crashes | 1.9 percent, 2 fatal crashes | 3.7 percent, 4 fatal crashes | 5.6 percent, 6 fatal crashes |
| Wed | 0.0 percent, 0 fatal crashes | 0.0 percent, 0 fatal crashes | 1.9 percent, 2 fatal crashes | 2.8 percent, 3 fatal crashes | 3.7 percent, 4 fatal crashes | 0.9 percent, 1 fatal crashes |
| Thu | 1.9 percent, 2 fatal crashes | 0.0 percent, 0 fatal crashes | 7.5 percent, 8 fatal crashes | 2.8 percent, 3 fatal crashes | 1.9 percent, 2 fatal crashes | 1.9 percent, 2 fatal crashes |
| Fri | 0.0 percent, 0 fatal crashes | 0.9 percent, 1 fatal crashes | 3.7 percent, 4 fatal crashes | 2.8 percent, 3 fatal crashes | 2.8 percent, 3 fatal crashes | 2.8 percent, 3 fatal crashes |
| Sat | 1.9 percent, 2 fatal crashes | 2.8 percent, 3 fatal crashes | 3.7 percent, 4 fatal crashes | 4.7 percent, 5 fatal crashes | 3.7 percent, 4 fatal crashes | 3.7 percent, 4 fatal crashes |
By hour
By month
- Jan4.7%
- Feb0.9%
- Mar3.7%
- Apr8.4%
- May2.8%
- Jun2.8%
- Jul9.3%
- Aug27.1%
- Sep9.3%
- Oct15.9%
- Nov8.4%
- Dec6.5%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes on I-90 in South Dakota first hit
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Collision with another vehicle | 39 | 36% |
| Rollover | 33 | 31% |
| Fixed object (tree, pole, barrier, ditch) | 24 | 22% |
| Other | 7 | 6.5% |
| Pedestrian | 4 | 3.7% |
| Cyclist | 0 | 0.0% |
| Parked vehicle | 0 | 0.0% |
| Not reported | 0 | 0.0% |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
How fatal crashes on I-90 in South Dakota compare with the state
Shares of fatal crashes from 2015 to 2024, against the share across all of South Dakota. A share is only given over 20 crashes.
| I-90 | South Dakota | ||
|---|---|---|---|
| On rural stretches | 83% | 82% | above the South Dakota share |
| At or near an intersection | 0.0% | 19% | below the South Dakota share |
| In the dark, road unlit | 31% | 31% | about the same as the South Dakota share |
| A drinking driver | 21% | 35% | below the South Dakota share |
| Speeding | 25% | 27% | below the South Dakota share |
| Occupants killed unbelted | 64% | 66% | below the South Dakota share |
| Hit-and-run | 0.0% | 1.8% | below the South Dakota share |
| A motorcycle involved | 19% | 19% | about the same as the South Dakota share |
| Pedestrians among the dead | 3.3% | 7.7% | below the South Dakota share |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Other roads in South Dakota with a page
All fatal crashes in South Dakota, with every road ranked.
Where the I-90 numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash whose road NHTSA filed as I-90 in South Dakota (filed under 3 spellings, such as "I-90 E", "I-90 W", "I-90 W2"). Ramps, frontage and service roads are left out. A fatal crash is one in which someone died within 30 days. The full method.