The Cedar Rapids Police Department is looking for the public’s assistance in locating a 15-year-old girl.Trinity Ervin, 15, was reported missing Monday morning after last being seen at 7:30 a.m. Friday at Washington High School, 2205 Forest Dr. SE, Cedar Rapids, according to an Operation Quickfind document released by the CRPD.According to the document, Ervin was last seen wearing a blue Washington school shirt, blue or black pants and pink and gray Nike shoes.