As a relatively “wet” state, most people think of Pennsylvania as having a bountiful water supply with over 86,000 miles of streams and rivers, an abundance of groundwater, and various economic sectors generally avoiding the water shortage difficulties of the western U.S. Think again. Based on predictions from various reports, notably the Pennsylvania Climate Impacts Assessment, Pennsylvania can expect warmer temperatures year-round, increased frequency of flood events, more rain than snow in winter, prolonged summer drought, and impacts to coldwater fisheries. Establishing minimum instream flows for Commonwealth waters offers a stepping stone for adapting to predicted changes.