Projection based on historical years with similar peak snowpack percentage. Shows expected elevation gain during the runoff season (April-August).
Since pre-runoff low on Apr 1
Based on 1 historical years with similar snowpack
Historical SWE trends for Upper Colorado. Current year shown in black.
Statistical shading percentiles are calculated from period of record (POR) data, excluding the current water year. Percentile categories range from: minimum to 10th percentile, 10th-30th, 30th-70th, 70th-90th, and 90th-maximum.
Each band shows 15 feet of elevation. Width indicates storage capacity—the lake is V-shaped, so higher elevations hold significantly more water per foot.
Average snowpack percentage for each major tributary that feeds into Lake Powell