Sau

As of September 7, 2026, Sau is filled to 73.3% of its total capacity, holding roughly 121 hm³ of water out of a maximum 165 hm³. At this level the reservoir is within its normal operating range. Of that total, about 149 hm³ is usable (live) storage.

Over the most recent week on record the fill level has held broadly steady (-1.2 pts), and it is 15.7 points above its level on the same date a year earlier.

Across the readings we hold for Sau — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 1.2% (March 5, 2024) to a high of 100.0% (January 28, 2020). On average the reservoir is fullest around June and at its lowest around October.

It is operated by ACA primarily for multiple purposes. It lies within the Cuencas Internas de Cataluña basin at 41.976°N, 2.384°E.