Upper Lake Powell area in Utah

Erosion, tectonic uplift, and a human-built dam have all shaped this stretch of the Upper Lake Powell area in Utah. An astronaut captured the image on July 28, 2023, using a Nikon D5 camera with a long 1,150 millimeter lens aboard the International Space Station. The green ribbons winding through the frame are water, snaking between the rust colored rock of the surrounding desert. Lake Powell is a man made reservoir created by the Glen Canyon Dam on the Colorado River, and from this height you can see how the water follows the twisting paths carved by rivers over millions of years.

The colors tell a story if you know what to look for. That vivid green comes from sediment and minerals suspended in the water, while the pale bands lining the shore mark where the lake level has dropped. Lake Powell has shrunk dramatically in recent decades due to drought and heavy water use across the American Southwest, so those bleached edges are essentially a high water mark left behind. What looks like an abstract design of orange, tan, and green is really a record of both natural forces and human decisions, seen from space.

This photograph comes from the ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit at Johnson Space Center. Beautiful as it is, the picture doubles as a scientific tool, and the branching shapes here are a reminder of how water shapes the land and how quickly that balance can shift.