SAC COUNTY — Two Harlan teenagers sustained injuries during a collision between a personal watercraft (PWC) and a pontoon around 3:17 p.m. Sunday, June 11. According to a report issued by the Iowa DNR, the accident occurred on Black Hawk Lake near Lake View. The report stated the pontoon was operated by Charles Lierman, 75, of Ankeny, and was traveling an estimated 15 miles per hour.