Debris‐flow activity in the Santa Catalina Mountains in July 2006 dramatically illustrated the potential for sizable debris flows to exit canyons along the mountain front and the potential for adverse impacts to properties near canyon mouths. The purpose of this study was to map the extent of prehistoric debris‐flow deposits at the mouths of selected Santa Catalina Mountain canyons in eastern Pima County. Arizona Geological Survey (AZGS) geologists mapped the extent of latest Pleistocene to Holocene debris‐flow deposits along channels at the mouths of 15 canyons. In late 2007 the scope of work was expanded to include mapping of modern (2006) debris‐flow deposits in Soldier Canyon, and to delineate the downstream extent of these deposits in other canyons. United State Geological Survey (USGS) geologists collected wood and rock samples from selected paleodebris‐flow deposits to date deposit‐ages using radiocarbon and cosmogenic dating techniques. This report summarizes our findings and describes the mapped debris‐flow deposits depicted on accompanying map sheets. 11 maps found in Digital Map Series 1A-1K 1:6,000