Streamflow statistics are used routinely by watershed planners, regulators, engineers, and managers for waterresource projects. Streamflow statistics for a streamgage can change over time as more flow data become available and (or) land use or climate in the watershed changes; consequently, streamflow statistics should be updated periodically. This report, done in cooperation with the Pennsylvania Department of Environmental Protection, presents updated streamflow statistics for 526 U.S. Geological Survey (USGS) continuous-record streamgages in Pennsylvania, New York, New Jersey, Delaware, Maryland, West Virginia, and Ohio using data collected through 2008.