That would be Valley High School in West Des Moines Iowa. They win every damn sports title every year, but they also have very good academics there so I'm kinda surprised they aren't the best. I think they've won like the last 4 football state titles, last 3 baseball state titles, wrestling titles, etc.
I agree, Valley WDM is probably the most overall dominant high school in Iowa. They are freaking stacked in every sport. Nothing against Kearney, but how did they actually pick them over some of the Lincoln and Omaha schools?