Description: <div style="text-align:Left; font-size:12pt;"><p style="margin-top:0px; margin-bottom:0px;"><span style="font-size:12pt;">Developed by the U.S. EPA<font color="#000080"> </font></span><a href="https://www.epa.gov/aboutepa/about-office-air-and-radiation-oar" style="font-size:12pt;"><font color="#000080">Office of Air and Radiation</font></a><span style="font-size:12pt;">,</span><span style="font-size:12pt;"> this content item depicts changes in the timing of annual high spring flow carried by rivers and streams from 1940 to 2018. This analysis focuses on parts of the country where streamflow is strongly influenced by snowmelt. Trends are based on the winter-spring center of volume, which is the date when half of the total January 1–July 31 streamflow (in the West) or half of the total January 1–May 31 streamflow (in the East) has passed by each streamflow gauge, reflecting the timing of spring snowmelt. Blue triangles represent later timing of winter-spring runoff, and brown triangles represent earlier timing of winter-spring runoff. Streamflow data were collected by the<font color="#000080"> </font></span><a href="https://waterdata.usgs.gov/nwis?" style="font-size:12pt;"><font color="#000080">U.S. Geological Survey (2020). </font></a><span style="font-size:12pt;">For more information, please visit the U.S. EPA<font color="#000080"> </font></span><a href="https://www.epa.gov/climate-indicators" style="font-size:12pt;"><font color="#000080">climate change indicators webpage</font></a><span style="font-size:12pt;">. These data and their corresponding metadata records can be downloaded from the<font color="#000080"> </font></span><a href="https://edg.epa.gov/metadata/catalog/main/home.page" style="font-size:12pt;"><font color="#000080">EPA Environmental Dataset Gateway </font></a><span style="font-size:12pt;">(EDG).</span><br /></p></div>
Copyright Text: Data Steward: U.S. Environmental Protection Agency, Office of Air & Radiation, Office of Atmospheric Programs; Content Item: U.S. Environmental Protection Agency, Office of Mission Support
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