Illustrates the man-made and natural alterations of hydrology north of Mt. Saint Helens after its eruption in 1980.
<a href="//commons.wikimedia.org/wiki/User:Jwfelder" title="User:Jwfelder">Justin Felder</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>. The basemap is sourced from USGS <a rel="nofollow" class="external free" href="https://ngmdb.usgs.gov/topoview">https://ngmdb.usgs.gov/topoview</a> The basemap is under the OpenStreetMap open-source license, and requires all derivative works to cite "©OpenStreetMap Contributors" and refer to the license.