Hi, if you want to come in June the whole month is great for walleye, salmon, smallmouth and cats. A suggestion, in the Pierre area we have some of the nicest campgrounds in the state. there are some of the best right below the dam with restaraunt, marina, bait shop right there. On this lower part of Oahe the water will be cooler than up by Whitlocks on north, so the walleyes will still be shallow and is great fishing pitching jigs into shore. You can trailer up to Cow Creek or Spring Creek and fish from there. Or you can trailer farther up to Little Bend and go across the lake and fish the mouth of the Cheyenne River area which is where the best bite on the lake happens in May and June. Lots of big open water on the lower end of the lake, you don’t have to worry about hitting any trees. Also, if the wind would blow to hard to get out on the lake you can go below the dam and fish the river which can also be awsome fishing in June.