Arquillo de San Blas

As of September 7, 2026, Arquillo de San Blas is filled to 71.4% of its total capacity, holding roughly 15 hm³ of water out of a maximum 21 hm³. At this level the reservoir is within its normal operating range. Of that total, about 19 hm³ is usable (live) storage.

Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 14.3 points below its level on the same date a year earlier.

Across the readings we hold for Arquillo de San Blas — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 66.7% (October 3, 2023) to a high of 100.0% (October 23, 2018). On average the reservoir is fullest around June and at its lowest around October.

It is operated by CHJ primarily for multiple purposes. It lies within the Júcar basin at 40.370°N, 1.230°W.