39 reservoirs with a combined capacity of 9,538 hm³ · latest official reading: 6 October 2026
The Guadiana basin is currently at 72.1 % of capacity, far above normal for the time of year. The week-41 average across 34 years of records is 48.7 %, a difference of +23.4 points.
For context: a year ago it stood at 58.1 % and a month ago at 73.2 %. Against last week’s reading it is essentially flat (+0.0 points).
Blue line: average monthly filling for the whole demarcation since 1992. The dot marks today’s reading, 72.1 % in October.
With 1,798 weeks of record since 1992, the average pattern of the Guadiana basin is clear: it peaks in April at 63.4 % and bottoms out in October at 48.7 %. That 15-point range makes it a moderately seasonal demarcation.
The highest reading in the whole series is 97.5 %, on 2 April 2013, and the lowest 8.6 %, on 14 November 1995. 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 2th demarcation of the 14 covered by the hydrological bulletin: its 9,538 hm³ account for 17.0 % of everything Spain can store in mainland reservoirs. Today it holds 6,875 hm³.
The 39 dams the hydrological bulletin tracks in the Guadiana basin, sorted by capacity. Linked names have their own page with the full record.
| Reservoir | Capacity (hm³) | Volume (hm³) | Fill | Δ week | Use |
|---|---|---|---|---|---|
| La Serena | 3,219 | 2,631 | 81.7 % | +0.0 | Irrigation / supply |
| Cíjara | 1,505 | 1,138 | 75.6 % | +0.1 | Irrigation / supply |
| Alange | 852 | 434 | 50.9 % | +0.1 | Irrigation / supply |
| Orellana | 808 | 593 | 73.4 % | +0.0 | Irrigation / supply |
| Andévalo | 634 | 538 | 84.9 % | −0.8 | Irrigation / supply |
| García de Sola | 554 | 267 | 48.2 % | −0.2 | Irrigation / supply |
| Chanza | 338 | 194 | 57.4 % | +0.3 | Irrigation / supply |
| Zújar | 302 | 260 | 86.1 % | +0.7 | Irrigation / supply |
| Sierra Brava | 233 | 82 | 35.2 % | +0.0 | Irrigation / supply |
| Torre de Abrahán | 183 | 134 | 73.2 % | −0.5 | Irrigation / supply |
| Villar del Rey | 131 | 95 | 72.5 % | −0.8 | Irrigation / supply |
| Villalba de los Barros | 106 | 94 | 88.7 % | +0.0 | Irrigation / supply |
| Búrdalo | 79 | 22 | 27.8 % | +0.0 | Irrigation / supply |
| La Colada | 58 | 47 | 81.0 % | +0.0 | Irrigation / supply |
| Alcollarín | 52 | 19 | 36.5 % | +0.0 | Irrigation / supply |
| Peñarroya | 51 | 44 | 86.3 % | +0.0 | Irrigation / supply |
| La Cabezuela | 43 | 23 | 53.5 % | +0.0 | Irrigation / supply |
| Ruecas | 42 | 28 | 66.7 % | +0.0 | Irrigation / supply |
| Gasset | 39 | 25 | 64.1 % | +0.0 | Irrigation / supply |
| Los Molinos | 34 | 30 | 88.2 % | +0.0 | Irrigation / supply |
| Vega del Jabalón | 34 | 12 | 35.3 % | +0.0 | Irrigation / supply |
| El Vicario | 32 | 19 | 59.4 % | +0.0 | Irrigation / supply |
| Canchales | 26 | 19 | 73.1 % | +0.0 | Irrigation / supply |
| Horno Tejero | 24 | 13 | 54.2 % | −4.2 | Irrigation / supply |
| Gargáligas | 21 | 14 | 66.7 % | +0.0 | Irrigation / supply |
| Valuengo | 20 | 7 | 35.0 % | +0.0 | Irrigation / supply |
| Nogales | 18 | 12 | 66.7 % | +5.6 | Irrigation / supply |
| Piedra Aguda | 16 | 12 | 75.0 % | +0.0 | Irrigation / supply |
| Cancho del Fresno | 15 | 12 | 80.0 % | +0.0 | Irrigation / supply |
| Aguijón, El | 11 | 10 | 90.9 % | +9.1 | Irrigation / supply |
| Montijo | 11 | 11 | 100.0 % | +0.0 | Irrigation / supply |
| Llerena | 8 | 7 | 87.5 % | +0.0 | Irrigation / supply |
| Brovales | 7 | 4 | 57.1 % | +0.0 | Irrigation / supply |
| Pto. Vallehermoso | 7 | 6 | 85.7 % | +0.0 | Irrigation / supply |
| Boquerón | 6 | 4 | 66.7 % | +0.0 | Irrigation / supply |
| Cubilar | 6 | 5 | 83.3 % | +0.0 | Irrigation / supply |
| Proserpina | 5 | 4 | 80.0 % | +0.0 | Irrigation / supply |
| Tentudia | 5 | 4 | 80.0 % | +0.0 | Irrigation / supply |
| Cornalbo | 3 | 2 | 66.7 % | +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 1992. 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.
