Mike Dettinger 2005 This Fact Sheet is one in a series that highlights information or recent research findings from the USGS National Streamflow Information Program (NSIP). The investigations and scientific results reported in this series require a nationally consistent streamgaging network with stable long-term monitoring sites and a rigorous program of data quality assurance, management, archiving, and synthesis. NSIP produces multi-purpose, unbiased surface water information that is readily accessible to all. application/pdf 10.3133/fs20053018 en U.S. Geological Survey Changes in streamflow timing in the western United States in recent decades reports