From the work of US Geological Survey's Richard Hereford. "Mormon Lake is a snow-melt fed hydrologically closed natural lake in north-central Arizona. Since 1906-1941, lake levels have fallen from 8-10 meters to mostly zero. The objective of this study is determine the causes of the decline, which appear to be largely related to 20th Century climate change."
Water level as of 9/28/2018 was zero, as illustrated in this picture.
The rhyodacite Mormon Mountain dome complex appears in the background.
Online resource: Climatic fluctuations, drought, and flow in the Colorado River Basin. USGS Fact Sheet https://pubs.usgs.gov/fs/2004/3062/pdf/fs2004-3062_version2.pdf