46% River Water 84% Supply Report

48% System Contents: 25.10 MAF 62% 3,700’ Crystal As of January 25, 2021 40%, 9.73 MAF Reservoir Current Elevation 91% 3,577’ Reservoir Capacities (MAF) 1,220’ Lake Mead Mid-Elevation 63% Reservoir Current Change* Maximum Release 3,575’ 40%, 10.57 MAF Lake Mead 10.47 + 0.16 25.90 Current Elevation 1,085’ Lake Powell 9.73 - 0.47 24.30 Tier 1 Shortage 3.15 - 0.01 3.75 1,075’ 0.16 - 0.03 0.34 Navajo Reservoir 1.07 - 0.01 1.70 0.40 0.00 0.83 0.11 0.00 0.12 Crystal Reservoir 0.02 0.00 0.03

* With respect to previous month’s report 1 PRESENTATION TITLE | DD.MM.YY As of 1/26/2021, snow accumulation in the Green River Basin (which contributes ~33% of the flows into Lake Powell) is at 6.0 in. (blue line), which is 67% of the 30-year median for this date of 9.0 in. (purple line) and is approximately half of last year’s SWE for this date (green line).

Snow accumulation in the Upper Basin (contributes ~42%) to date is at 6.2 in., which is 71% of the 30-year median for this date of 8.7 in.

Snow accumulation in the San Juan River Basin (contributes ~13%) to date is at 10.7 in., which is 88% of the 30-year median for this date of 12.2 in.

For the overall Colorado River Basin above Lake Powell, the snow accumulation to date is at 6.6 in., which is 71% of the 30-year median for this date of 9.2 in. Powell Pool Elevations - January 2021 24-Month Study 3,700

WY 2020 Equalization Line = 3,657' WY 2021 Equalization Line = 3,659' WY 2022 Equalization Line = 3,660'

3,650

Upper Elevation Balancing Tier

3,600 3,575'

Mid Elevation Release Tier 3,550 3,525'

3,500 EOCY 2022 Lower Elevation Balancing Tier MAX = 3,623' MOST = 3,578' Powell Pool Elevation (ft amsl) (ft Elevation Pool Powell EOCY 2021 MIN = 3,519' 3,450 MAX = 3,578' MOST = 3,559' MIN = 3,537' Current Month Current 3,400

Bottom of Lower Elevation Balancing = 3,370'

3,350 12/31/2019 12/30/2020 12/31/2021 12/31/2022

| MOST MIN MAX Historic Mead Pool Elevations - January 2021 24-Month Study 1,140

1,120 EOCY 2021 MAX = 1,089' MOST = 1,070' EOCY 2022 MIN = 1,068' MAX = 1,080' MOST = 1,057' 1,100 MIN = 1,054' 1,090'

Tier 0 1,080 1,075'

Tier 1

1,060 Mead Pool Elevation (ft amsl) (ft Elevation Pool Mead

1,050'

Tier 2

1,040 Month Current

1,025' Tier 3 1,020 12/31/2019 12/30/2020 12/31/2021 12/31/2022

| MOST MIN MAX Historic