The Sheriff Department Marine Patrol shares the responsibility with the Department of Natural Resources to patrol the lakes and streams of the county. If an emergency should arise on any waterways boaters are urged to contact 911.

Presque Isle County has 301 miles of trout streams, 99 lakes, the largest of which is Grand Lake with a total area of 6,080 acres; and 72 miles of Lake Huron shore which provide variety to enchant any visitor. There are 3 inland water falls, Rainey River, Swan River and Ocqueoc.