Project goals of the Aquatic Macroinvertebrate Survey of Elkhorn Creek were to: 1) have the Montana Natural Heritage Program (MTNHP) analyze macroinvertebrate samples collected by the Gallatin District Fisheries Biologist, 2) assess aquatic community integrity and potential macroinvertebrate Species of Concern (SOC) in relation to future Westslope Cutthroat Trout introductions (Pers. comm. Bruce Roberts, 7/10/2006). This report represents the local reach-scale, macroinvertebrate assessment that included fish surveys by the USFS biologist.