Week ending July 27, 2026
Weekly recap: Mead and Powell keep edging down as heat holds on
Weekly Colorado River Basin report with reservoir level changes, storage movement, operating decisions, policy developments, and a two-week weather outlook.
Reclamation's July 27 weekly hydrologic update shows another small but steady loss across the main system. As of July 26, Lake Powell was at 3,522.90 feet and 23% full. Lake Mead was at 1,041.22 feet and 27% full. Total Colorado River system storage fell to 19.032 million acre-feet, or 33% of capacity, compared with 22.898 million acre-feet and 39% at the same time last year.
The runoff story is effectively set for the year. Powell's water year 2026 unregulated inflow forecast remains 3.501 million acre-feet, or 36% of normal, and the April-July runoff forecast remains 1.080 million acre-feet, or 17% of normal. Upper Basin precipitation to date improved to 83% of normal, but new moisture does not rebuild the spring runoff total.
The operations read is mostly unchanged: protect Powell first, manage Mead with less room than usual, and watch heat-driven demand. Reclamation's July 24-Month Study projects Powell near 3,507.68 feet and Mead near 1,037.31 feet at the end of calendar year 2026. Those projections improved slightly from the prior study, but the system is still carrying roughly 3.9 million acre-feet less water than it had one year ago.
Recent basin updates
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July 27, 2026: System storage slips to 19.032 million acre-feet
Reclamation listed Lake Powell at 3,522.90 feet and 23% full, Lake Mead at 1,041.22 feet and 27% full, and total Colorado River system storage at 19.032 million acre-feet, or 33% of capacity, as of July 26.
Bureau of Reclamation
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July 20, 2026: Mead and Powell keep falling after runoff season
Reclamation listed Lake Powell at 3,523.43 feet and 23% full, Lake Mead at 1,041.81 feet and 27% full, and total Colorado River system storage at 19.131 million acre-feet, or 33% of capacity, as of July 19.
Bureau of Reclamation
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July 22, 2026: Low Powell water levels force marina and ramp adaptations
AP reports that Lake Powell marinas are relocating, extending ramps, and adapting service as low water changes access. The story connects the operational chart to recreation, tourism, and Powell being roughly 33 feet above minimum power pool.
Associated Press
Weather outlook
Sources checked July 27, 2026.
Western heat remains the near-term pressure CPC says strong high pressure is expected to keep a prolonged heat wave over the West into the beginning of August, with the Southwest, Great Basin, Rockies, and California under elevated heat risk. The short-term water impact is demand and evaporation pressure. Storms may help locally where they land, but they cannot change the weak April-July Powell runoff total.
August 1-August 9, 2026: Heat continues, with a Southwest monsoon signal.
News review completed July 29, 2026.