Purpose: This document is a technical note (TN) that outlines how to evaluate physical, chemical, biological, and statistical indicators of the ordinary high water mark (OHWM) for reservoirs of the Arid West, with identification of high water indicators around Lake Powell serving as a case study (Figure 1). The focus of this TN is to describe observed indicators, the processes that shape them, and how to put the information in context based on past and present water levels. It can be particularly complicated to evaluate evidence of OHWM in arid west lakes, because of the years of drought that has occurred in this region, leaving indicators high and dry over years. Therefore, this TN also provides information on how to apply the same weight-of-evidence (WoE) approach that was introduced for OHWM delineation in rivers and streams by David et al. (2025) to arid west lakes and reservoirs. Lake Powell is used as a case study to show how to interpret the indicators along the lake and evaluate the relevance, strength, and reliability of these indicators in relation to high water stage in the lake.