(Milwaukie, OR)  --  Police are searching for a teenage girl who's been missing for more than a week.  Police say 16-year-old Sierra Sunshine Porter left her home near Southeast 80th Avenue and Clackamas Street in Milwaukie on her skateboard on March 31st.  She hasn't been seen since, and family members say she left her asthma inhaler at home.  Anyone with information is urged to contact police.