newman and silver are both year round lakes in spokane county but not sure how good they are for trout. I would recomend Rock lake in Whitman county there is a little room for shore fisherman there but most area is private so make sure your not tresspasing. My buddy and I useally stop there when were pheasent hunting and through a line in. Good brown and rainbow catches come from here its a pretty consistant lake. It might be a little farther drive but probly will show best results good luck hope this helps.