Peshtigo Flowage – Walleye Spawning Reef Here are a bunch photos for the Peshtigo Flowage – Walleye Spawning Reef project round was placement – note stone in middle of river – larger underwater reef constructed to divert or pull flow towards both islands 4 to 8 inch cobble added Boom 2 Island 24 down – preconstruction Island 24 up – preconstruction – initial staking of site Marsh mats for heavy equipment enrty and exit Pre-Construction February 2012 small (1 to 2 inch) round wash placed over 4 to 8 inch cobble Woody debis removed and boulder placement