Pick the Preps: Oak Ridge-Folsom, Del Oro-Granite Bay, a girls flag football game and more

This much we know as we barrel into Sierra Foothill League openers on Friday night: The SFL stands alone as the top high school football conference in Northern California. And bonus points for it being an all-public school collection of programs that feed off feeder programs — youth football, freshman and junior varsity programs. Bee No. 1 Folsom has won the SFL championship almost every year since entering the league via realignment before the 2014 season with Rocklin taking it in 2021, but the Bulldogs will not have an easy path to the top. Not with No. 2 Oak Ridge,…