Photo by U.S. Fish & Wildlife Service
Barriers
Hundreds of dams throughout the Great Lakes that were built for various purposes now serve to block lampreys from productive habitat. Some barriers have been built specifically to control sea lampreys. Construction of low-head barriers to block spawning runs of sea lampreys began in the late 1970's. Since then barriers have been constructed on several streams in Michigan and Wisconsin in cooperation with state and local agencies or corporations.
Some barriers such as the Brule River barrier have been constructed with a fish passageway or jumping pool to allow fish to pass while still blocking sea lampreys. All barriers are designed to incorporate trapping sites for the removal of spawning sea lamprey.
Streams where barriers have been constructed specifically to block lamprey migrations are listed below.
Brule River - Lake Superior Days River - Lake Michigan Fumace Creek - Lake Superior West Branch Whitefish River - Lake Michigan Middle River - Lake Superior Albany Creek - Lake Huron Miners River - Lake Superior East Branch Au Gres River - Lake Huron Misery River - Lake Superior Green Creek - Lake Huron Betsie River - Lake Superior Ocqueoc River - Lake Huron Carp Lake Outlet - Lake Michigan
