A boat at a landing and a kayak on the water at Lees Ferry, Colorado River, Grand Canyon

A boat with fishing poles tied at a landing at Lees Ferry, Colorado River, downstream of Glen Canyon Dam in Grand Canyon National Park. A kayaker is on the water, and people are visible at the far shore. Photo taken during the spring "disturbance flow" in March, 2021 by Lucas Bair, SBSC, USGS.

Experimental Spring disturbance flows from Glen Canyon Dam mimic the natural pre-dam hydrograph and are used to benefit the Colorado River ecosystem. More information on this disturbance flow can be found at: https://www.usgs.gov/centers/southwest-biological-science-center/scienc….