Sistema Valle de Arán

As of September 7, 2026, Sistema Valle de Arán is filled to 13.6% of its total capacity, holding roughly 3 hm³ of water out of a maximum 22 hm³. At this level the reservoir is critically low.

Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 31.9 points below its level on the same date a year earlier.

Across the readings we hold for Sistema Valle de Arán — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 13.6% (April 7, 2026) to a high of 54.5% (September 4, 2018). On average the reservoir is fullest around October and at its lowest around May.

It is operated by Ebro. It lies within the Ebro basin at 0.000°N, 0.000°E.