KELSO, Cowlitz County, Wash., Oct. 5, 2026 — A multi-vehicle crash blocked lanes on southbound I-5 near milepost 43 on Sunday evening, October 4, with several people reportedly injured and one person taken into custody on suspicion of DUI.
The collision was first reported around 5:18 p.m., when southbound I-5 was briefly blocked entirely. Within minutes, responders had traffic limited to the center and right lanes. An additional medic unit was called to the area shortly after 5:25 p.m. to help with injuries, though the number and severity of those hurt have not been released.
By about 5:36 p.m., vehicles and crews had shifted into the middle and right lanes, opening the left lane to traffic. One person was reported in custody, and the incident was under investigation for driving under the influence. No further details on that person have been released.
The backup grew to roughly 2.5 miles as drivers were funneled through a single open lane for part of the evening. Two lanes were reported to have reopened by about 9:15 p.m., easing delays. It was not immediately clear how many vehicles were involved or whether any injuries were serious.
Our thoughts are with those who were injured, and we wish them a full recovery.
How Investigators Build a DUI Crash Case
A suspected impaired-driving crash does not get resolved at the roadside. Officers first focus on clearing the scene and getting the injured to care, then turn to documenting skid marks, vehicle positions, and damage before anything is moved or towed. That groundwork often takes hours, even after lanes reopen to traffic.
Once a driver is arrested on suspicion of DUI, blood or breath evidence typically has to go through a crime lab, a process that can take weeks rather than days. Investigators also gather dash-cam or nearby surveillance footage, pull data from vehicle computers where available, and interview witnesses while their memories are fresh. Each piece gets cross-checked against the physical evidence at the scene.
Agencies usually wait to release names until next of kin have been notified, and a case is not considered final until toxicology results and a full crash reconstruction are complete. That is why early reports, including lane closures and injury counts, often look different from the final report an agency issues later.
Frequently Asked Questions
Why do impaired-driving crashes tend to cause more serious injuries?
Alcohol and drugs slow reaction time and impair judgment, so impaired drivers often fail to brake or steer away before impact. That means crashes happen at higher speeds or with less avoidance, increasing the force involved.
Can drugs other than alcohol impair driving?
Yes. Prescription medications, over-the-counter drugs, and illegal substances can all slow reaction time, affect coordination, or cause drowsiness. Investigators test for a range of substances, not just alcohol, when impairment is suspected.
What are common signs of an impaired driver?
Weaving between lanes, inconsistent speed, delayed braking, and slow response to traffic signals are common warning signs. Witnesses who notice this kind of driving are encouraged to report it to authorities rather than attempt to intervene directly.
How does alcohol affect driving ability?
Alcohol slows reaction time, narrows peripheral vision, and impairs coordination and judgment, even at levels below the legal limit. Its effects compound with fatigue or other substances in the system.
What to Do After a DUI Crash in Kelso, WA
If you're involved in a crash where impairment is suspected, move to a safe spot away from traffic if you're able, and call 911 right away. Let responding officers document the scene fully before vehicles are moved, and accept medical evaluation even if injuries seem minor at first, since some symptoms take hours to appear.
Keep a record of what you remember while it's fresh, including the time, location, and any details about the other vehicles involved. If you're contacted later by investigators or insurance adjusters, it's fine to share basic facts and let the official report take its course. Reach out to local support services if you need help coping with the aftermath.
