In Washington, he could still recover even if he was mostly to blame. In Oregon, that same crash can wipe out the claim if he is found more than 50% at fault.

Picture a real Hillsboro scenario: your brother is driving on TV Highway during a hard storm, hits standing water, spins, and gets hit by another driver. The insurance adjuster immediately says "hydroplaning means driver error." That is bad shorthand, not the law.

In Oregon, shared blame is handled under modified comparative negligence. That means:

• If your brother is 0% to 50% at fault, he can still recover money, but it gets reduced by his share of fault.
• If he is 51% or more at fault, he gets nothing from the other side.

So if his damages are $40,000 and he is found 30% at fault, recovery would drop to $28,000. If he is found 55% at fault, the claim is barred.

The other side will usually try to pin fault on him by saying he was driving too fast for conditions, had worn tires, followed too closely, braked badly, or ignored visible pooling water. They do this even when the other driver also messed up.

Fault is usually pieced together from the police report, photos of the roadway, witness statements, vehicle damage, dash cam footage, phone records, and weather data. If debris, clogged drainage, or flooding played a role, ODOT or the local road agency may also become part of the story. A hydroplaning crash is not automatically "your brother's fault."

If he was badly hurt and taken toward OHSU in Portland, the medical records can also help show the force and angle of impact, which sometimes undercuts the insurer's version of events.

Bad advice says "if he spun out, he loses." In Oregon, that is false. The real question is whether he stayed at 50% fault or less.