Topaz Lake is a relatively large reservoir, with a maximum pool of , with  surface, a length of , a width of , and a maximum depth of . The levee and reservoir have been owned and operated by the Walker River Irrigation District since its construction.
Topaz Lake holds a significant amount of water, reaching a maximum capacity of , spanning across an area of  on its surface, with dimensions of length and width, and a greatest depth of . This reservoir has been under the control of the Walker River Irrigation District from the moment it was constructed.