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Interstate 39
Fatal crashes 2015–2024 68Deaths 78Counties 7Latest 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.
Interstate 39 in Wisconsin was the trafficway in 68 fatal crashes between 2015 and 2024, in which 78 people died.
That is 1.3% of the 5,431 fatal crashes in Wisconsin over the same years. The ten-year crash count fell 16% from 81 in 2005–2014 to 68 in 2015–2024.
The crashes were concentrated in Dane County (22), Rock County (15) and Columbia County (11) and 4 other counties.
17.6% of the crashes had a driver reported as drinking (Wisconsin: 33.4%) and 23.5% had a speeding-related driver (31.0%); pedestrians were 6.4% and motorcyclists 10.3% 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 Wisconsin
| Measure | Interstate 39 | Wisconsin |
|---|---|---|
| Fatal crashes, 2015–2024 | 68 | 5,431 |
| Deaths, 2015–2024 | 78 | 5,959 |
| Deaths per fatal crash | 1.1 | 1.1 |
| Share of state fatal crashes | 1.3% | 100% |
| Change vs previous ten years | -16% | -5% |
Factor shares
Counties along the route
| # | County | Fatal crashes on I-39 | Share of route | County total, all roads |
|---|---|---|---|---|
| 1 | Dane County | 22 | 32% | 311 |
| 2 | Rock County | 15 | 22% | 191 |
| 3 | Columbia County | 11 | 16% | 92 |
| 4 | Marathon County | 8 | 12% | 110 |
| 5 | Portage County | 5 | 7% | 54 |
| 6 | Waushara County | 5 | 7% | 46 |
| 7 | Marquette County | 2 | 3% | 25 |
Hour of day
Share of fatal crashes on Interstate 39 beginning in each hour, 2015–2024; tick marks the Wisconsin share for all roads.
Other routes in Wisconsin
- Interstate 94 111
- US Route 12 108
- Interstate 41 95
- State Route 35 84
- Interstate 43 83
- State Route 32 76
- US Route 51 73
- US Route 151 70
- US Route 45 65
- US Route 14 59
- US Route 8 58
- US Route 10 58
All routes and counties in Wisconsin
Questions and answers
How many fatal crashes have there been on Interstate 39 in Wisconsin?
68 fatal crashes with 78 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 39 had the most fatal crashes?
Dane County (22), Rock County (15), Columbia County (11), Marathon County (8) and Portage County (5).
What share of crashes on Interstate 39 involved alcohol or speeding?
17.6% had a driver reported as drinking and 23.5% a speeding-related driver, against 33.4% and 31.0% for all fatal crashes in Wisconsin.
When do fatal crashes happen on Interstate 39?
46.3% 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.