The U.S. Geological Survey, in collaboration with Iowa Department of Natural Resources and U.S. Army Corps of Engineers, will ...

The U.S. Geological Survey, in collaboration with Iowa Department of Natural Resources and U.S. Army Corps of Engineers, will place monitoring equipment this week at several locations in Pool 13 ...

Dark blue water flows through the dam without sediment, which is trapped upstream in the reservoir, one of an estimated 50,000 in the river basin. Credit NASA Landsat/U.S. Geological Survey.

As glaciers pushed through river valleys and over ... NASA Earth Observatory image by Robert Simmon, using Landsat 8 data from the US Geological Survey. Caption by Adam Voiland.