Numerous sites along the Norris Junction-Mammoth Junction road were evaluated for bat use during the summer season in 1997 and 1998. All known cave sites were checked and special attention was given to water bodies near the road since these areas are known to draw bats from the surrounding region for feeding and interaction. A total of 33 sites were studied ranging from a known maternity pit cave site to a cold alpine pond. The primary objective was to identify and document bat presence and activity along the corridor affected by reconstruction of the Grand Loop Road between Norris and Mammoth. Information gathered from field activities would be used to make sound management decisions on protecting the available resources and reducing the impact of construction activities on future projects of this type. Figures 1 through 6 identify the locations of each site studied on a portion of the USGS topographic quadrangle and Table 2 is a listing of the latitude and longitude readings from either the topo map or from GPS instrument readings taken in the field. Although care was taken to get as much information as possible, a wide variety of habitat settings were tested to provide the clearest picture of overall bat activity in the study area.