The 2016 MetroWest Adolescent Health Survey (MWHAS) marks the beginning of a new decade in monitoring trends in adolescent health behaviors to advance school and community prevention efforts. Since 2006, the MWAHS has been administered every other year in communities served by the MetroWest Health Foundation, with the goal of supporting data-driven improvements in health programs and policies at the local and regional levels. In 2016 alone, more than 40,000 students were surveyed in 26 school districts, providing important adolescent health data on key areas of concern and emerging health issues. Over the course of the initiative, the MWHAS data has greatly enhanced school and community efforts to prevent harm from risky behaviors and improve adolescent physical, mental, and emotional wellbeing. This data report is for high school, grades 9-12.