Marine patrol officers will discuss water safety May 9, 2023 11:30 am Mercer Island Police Department Marine Patrol officers will offer life jacket fittings and boater safety tips from 2-5 p.m. on May 20 at Mercerdale Park. Here, officers patrol Lake Washington during Seafair on Aug. 7, 2022. Reporter file photo Mercer Island Police Department Marine Patrol officers will offer life jacket fittings and boater safety tips from 2-5 p.m. on May 20 at Mercerdale Park. Here, officers patrol Lake Washington during Seafair on Aug. 7, 2022. Reporter file photo