Valmayor

As of September 7, 2026, Valmayor is filled to 68.6% of its total capacity, holding roughly 85 hm³ of water out of a maximum 124 hm³. At this level the reservoir is within its normal operating range. Of that total, about 112 hm³ is usable (live) storage.

Over the most recent week on record the fill level has held broadly steady (-0.8 pts), and it is 15.3 points below its level on the same date a year earlier.

Across the readings we hold for Valmayor — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 46.8% (August 20, 2024) to a high of 99.2% (May 13, 2025). On average the reservoir is fullest around April and at its lowest around August.

It is operated by CHT primarily for multiple purposes. It lies within the Tajo basin at 40.551°N, 4.056°W.