Distribution of VHS in Wisconsin

VHS was first detected in Wisconsin in May 2007 in the Lake Winnebago and Lake Michigan systems. Because Lake Superior and the Mississippi River are both connected to Lake Michigan, we suspect that VHS is present in those waters, though it has yet to be confirmed.

Waters infected with VHS

• Lake Michigan
• Lake Superior
• Lake Winnebago System

Connecting waters suspected of being infected with VHS, but not confirmed

• Mississippi River
• And all of their tributaries upstream to the first dam or barrier impassable to fish.

Complete lists of waters:

• Lake Michigan Drainage Waters [PDF]
• Lake Superior Drainage Waters [PDF]
• Mississippi River Drainage Waters [PDF]

Additional maps:

• Map of the Lake Winnebago System [PDF]
• Map of VHS testing efforts and results - 2006 to 2012 [PDF]