Black Canyon
Another area within Lake Mead NRA rich with springs is the Black Canyon vicinity downstream of Hoover Dam. Here you can find springs of both the thermal and non-thermal variety with water temperatures ranging from about 55 to 136 degrees Fahrenheit. Spring discharge below the Black Canyon can be diffuse, often taking the form of large seeps with wet rock faces that at times are up to 100 feet long. Many of these seeps are covered with a mixture of travertine and algae-type vegetation that can range in brilliant shades of green, depending upon the temperature and perhaps the mineral content of the water. Some springs discharge into side canyons which produce brooks that then discharge into the Colorado River, while others discharge water from the Black Canyon walls directly. A few of these features such as Nevada Hot Spring and Arizona Hot Spring can be reached by a hiking trail while many others, such as the springs in Boy Scout Canyon, can only be reached easily by boat.
more..