There is no ladder to reach the hot springs from the river. If you want to go to the springs, take the Hot Springs Trail over the saddle and down to the springs. If you want to go to the river and not the springs, take White Rock Canyon to the river and back.
There are several hot springs below Hoover Dam on the Colorado River recently designated as the Black Canyon National Water Trail. Some areas can be done by land, some can be done by water and some can be done by both. These include areas like Sauna Cave, Heated Cove, Gold Strike Hot Springs (Nevada Hot Springs), Lone Palm, Boy Scout Hot Springs, Moonscape Hot Springs and Ringbolt Hot Springs (Arizona Hot Springs)