And here's a USGS site that delineates a watershed from any point on a stream: https://www.usgs.gov/mission-areas/water-resources/science/streamstats-streamflo

And here's a USGS site that delineates a watershed from any point on a stream: https://www.usgs.gov/mission-areas/water-resources/science/streamstats-streamflow-statistics-and-spatial-analysis-tools https://www.usgs.gov/mission-areas/water-resources/science/s...