USGS Earth Science Photographic Archive digital file: hjk00645
Echo Park is a wide bottom at the confluence of the Green and Yampa rivers. Cliffs along this section of the canyon consist of Weber Sandstone (Pennsylvanian and Permian age). Powell named the area for the tremendous echoes his crew could produce off the cliffs. Members of the First Expedition had already been to down the Yampa River valley. After the trials of the Canyon of Lodore the expedition's morale was improved knowing that they were camping in a familiar location. Downstream of Echo Park, the Green River enters Whirlpool Canyon.
