11 reservoirs with a combined capacity of 684 hm³ · latest official reading: 6 October 2026
The Galicia-Costa demarcation is currently at 50.1 % of capacity, about normal for the time of year. The week-41 average across 38 years of records is 51.5 %, a difference of −1.4 points.
For context: a year ago it stood at 43.9 % and a month ago at 57.6 %. Against last week’s reading it is falling fast (−1.6 points).
Blue line: average monthly filling for the whole demarcation since 1988. The dot marks today’s reading, 50.1 % in October.
With 2,023 weeks of record since 1988, the average pattern of the Galicia-Costa demarcation is clear: it peaks in May at 77.7 % and bottoms out in October at 52.1 %. That 26-point range makes it a markedly seasonal demarcation, with a demanding irrigation season.
The highest reading in the whole series is 95.2 %, on 17 February 2026, and the lowest 32.6 %, on 4 December 2007. Comparing today against those two extremes says more than the bare percentage: 50 % is comfortable in a demarcation that rarely tops 60 %, and worrying in one that usually reaches summer full.
By capacity it is the 11th demarcation of the 14 covered by the hydrological bulletin: its 684 hm³ account for 1.2 % of everything Spain can store in mainland reservoirs. Today it holds 343 hm³.
The 11 dams the hydrological bulletin tracks in the Galicia-Costa demarcation, sorted by capacity. Linked names have their own page with the full record.
| Reservoir | Capacity (hm³) | Volume (hm³) | Fill | Δ week | Use |
|---|---|---|---|---|---|
| Portodemouros | 297 | 139 | 46.8 % | −2.4 | Hydropower |
| Eume | 123 | 84 | 68.3 % | −1.6 | Hydropower |
| Fervenza | 103 | 39 | 37.9 % | −1.9 | Hydropower |
| Ribeira, A | 33 | 17 | 51.5 % | +0.0 | Hydropower |
| Barrie de la Maza | 31 | 10 | 32.3 % | +0.0 | Hydropower |
| Cecebre | 22 | 10 | 45.5 % | −4.5 | Irrigation / supply |
| Eiras | 22 | 11 | 50.0 % | +0.0 | Irrigation / supply |
| Sta Uxia | 18 | 12 | 66.7 % | +5.6 | Hydropower |
| Villagudín | 18 | 15 | 83.3 % | +0.0 | Irrigation / supply |
| Forcadas, As | 11 | 4 | 36.4 % | +0.0 | Irrigation / supply |
| Riocobo | 6 | 2 | 33.3 % | +0.0 | Irrigation / supply |
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The figures on this page come from the official MITECO reservoir archive, the same database behind Spain’s weekly hydrological bulletin. The bulletin covers every mainland reservoir above 5 hm³ of capacity and is published every Tuesday with Monday’s reading.
The latest reading here is from 6 October 2026, and the comparison series starts in 1988. Nothing is estimated, interpolated or forecast: the percentage is stored volume divided by the usable capacity the bulletin itself assigns to the dam. Historical averages are computed over the same calendar week in every previous year, the only fair comparison in a system with such marked seasonality.
National summary and reservoir search on Reservoirs of Spain.
