Lake Mead is about 30 miles south of Las Vegas in southern Nevada. It is the largest reservoir in the United States and can hold 28,500,000 acre-feet or 9.3 trillion gallons of water. Lake Mead is a popular spot for recreation including fishing, boating, hiking, and scuba diving.
USGS Nevada Water Science Center currently has several streamflow gages on tributaries to Lake Mead.
DataReal-Time Streamflow :: Daily Values :: Peak-Flow :: Water Quality
Research Activities at Lake Mead
Lake Mead Bibliography: List of USGS Nevada WSC publications about Lake Mead, including cooperative State publications.
As the level of Lake Mead drops, a white band appears on the rocks above the water line. This white band is called a "bathtub ring". The current bathtub ring seen around Lake Mead has been caused by a decade of drought.
However, 2011 was a great water year. Deep snow pack in the Rocky Mountains has led to a rise in the Colorado River, and more water in Lake Mead. So far this year, the lake has risen almost 30 feet.
NASA Earth Observatory has a web page about the drought and it's effects on Lake Mead at http://earthobservatory.nasa.gov/Features/LakeMead/
This web page features images from the Landsat satellite that show a comparison of water levels in the lake from different years.