Michigan Recreation Boating Information System (MRBIS) Your next boating adventure starts here! Search and find information on 1,300 public boating access sites and over 80 harbors and marinas throughout the State of Michigan. This site lists boat launches and marinas administered by State, county, and local units of government, and includes amenities, management, contact information, maps, a "Fish Finder" and more!
Online Boating Safety Classes and ExamMichigan now offers two online boating safety classes and Exam: BoatEd.com and BoaterExam.com
Download a Copy of the Michigan Harbors Guide This publication is designed to offer information, location and amenities of Michigan's many harbors. It provides an aerial photograph and short description of each harbor to offer you a view of what to expect while traveling on Michigan's waters.
Houghton Lake Dredged Holes Houghton Lake has a large amount of dredged holes that can present a hazard to those unfamiliar with them. These holes were created many years ago by a dredging machine that pulled material from the bottomlands of Houghton Lake. The holes, which vary in size and depth, are shown on the map which is available here. There is also a listing of the known holes which have been inventoried by members of the Houghton Lake community. This list contains detailed location, depth and size information for reference. The list can be found here. The DNR does not certify the accuracy of this information and it is provided as a reference only.