Urkulu

As of September 1, 2026, Urkulu is filled to 80.0% of its total capacity, holding roughly 8 hm³ of water out of a maximum 10 hm³. At this level the reservoir is high.

Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 10.0 points below its level on the same date a year earlier.

Across the readings we hold for Urkulu — 418 data points between September 4, 2018 and September 1, 2026 — the level has ranged from a low of 50.0% (September 19, 2023) to a high of 100.0% (February 12, 2019). On average the reservoir is fullest around March and at its lowest around October.

It is operated by Cuencas Internas del País Vasco. It lies within the Cuencas Internas del País Vasco basin at 0.000°N, 0.000°E.