Birch: May 16. Elevation above normal, water 60s and murky. For current elevation conditions go to the U.S. Army Corps of Engineers website at https://www.swt-wc.usace. army.mil/BIRC.lakepage.html. Largemouth bass good on plastic baits and spinnerbaits in coves and along shallows. Report submitted by Jeremy Bersche, game warden stationed in Osage County.