Watershed boundaries for study sites of the U.S. Geological Survey Surface Water Trends project
This product contains 1,297 watershed boundaries for water quality study sites of the U.S. Geological Survey (USGS) National Water Quality Program (NWQP) Surface Water Trends project.  These include sites where water quality information was collected by both USGS and non-USGS agencies. The data consist of 1,285 …