If your vehicle has been "impounded" to a tow yard, you should contact the tow company directly regarding your personal property. They may allow you to get your registration and proof of insurance out of the vehicle so you can complete the Impound Release Form at the Sheriff's Office.
If your vehicle has been towed as a "DUII Forfeiture," contact the Sheriff's Office Property Technician at 541-265-4912 to set up an appointment to receive your property. This does not include anything that is attached to the vehicle.