Check out the Missoula Climbing Community page on facebook, pretty active page with lots of local climbers. Also, Big Sky Ice is a state-wide guidebook with most of the Missoula area climbs in it. Finley Creek up near Arlee is probably the most popular spot along with Mission Falls but there is a lot of ice spread out in the Bitterroot too. I've been out of town recently so no idea about current conditions, this was my last day out climbing.