Tassi and Pakoon Springs are both in the Grand Wash Trough in the western part of Grand Canyon-Parashant National Monument on the Arizona Strip. The monument is jointly managed by the National Park Service (NPS) and the Bureau of Land Management. This study ...

During the 20th century, floods were the number-one natural disaster in the United States in terms of the number of lives lost and property damage. For more than 110 years the U.S. Geological Survey (USGS) has measured floods for the Nation’s benefit while ...