From this AP story:
A plan by state officials to kill up to 60 wolves in north-central Idaho to protect elk herds has had little success so far, after aerial gunners and now state officials and hunting outfitters report limited results. A reported six wolves have been killed so far, five by aerial gunners in May before that method was abandoned because of low success due to the wolves being in thick timber. An Idaho Department of Fish and Game conservation officer shot another wolf near Powell on July 18. "I would have thought we would have had more, but that is it," Dave Cadwallader, supervisor of the department's Clearwater Region, told the Lewiston Tribune.