Boos, where are you from? I fish that part of the river, my folks have a place there and fish it pretty much every weekend. It is about 4 hours for me to get there, about 5.5 to Pierre. If it was not for the free lodging and good meals, I would probably make the trek to Oahe more.
As far as SD fishing forums, I have not found any real good ones. Other than social media to get reports from guides. Fishinghutch.com for the pierre area is about as good as it gets. Allen’s Hillside for Chamberlain area is not bad… get further south and it is all pretty much word of mouth. I am fortunate enough to get a stream of pictures sent to me on my phone from my dad, and a few others from way up north in SD to keep a pretty good pulse on the action out there.