Cities throughout the world have implemented bike-share systems as a strategy for expanding mobility options and improving the sustainability of the urban transportation system. These systems have attracted substantial ridership, even in the U.S., but the impact on overall levels of bicycling and other modes of travel have not been well documented. The purpose of this project is to document the impacts of a bike-share system to be launched by the Sacramento area by the Sacramento Area Council of Governments (SACOG) in 2018. The project uses a before-and-after methodology to directly measure the impact of the bike-share system on levels of bicycling, transit use, and vehicle-miles of travel, as well as attitudes towards bicycling in the area served by the system. This report summarizes the method and results for the first phase of the study, the “before” survey implemented in April 2016.