35 reservoirs with a combined capacity of 7,602 hm³ · latest official reading: 6 October 2026
The Duero basin is currently at 48.9 % of capacity, about normal for the time of year. The week-41 average across 38 years of records is 49.8 %, a difference of −0.9 points.
For context: a year ago it stood at 57.0 % and a month ago at 57.6 %. Against last week’s reading it is falling fast (−2.5 points).
Blue line: average monthly filling for the whole demarcation since 1988. The dot marks today’s reading, 48.9 % in October.
With 2,023 weeks of record since 1988, the average pattern of the Duero basin is clear: it peaks in May at 76.1 % and bottoms out in October at 49.4 %. That 27-point range makes it a markedly seasonal demarcation, with a demanding irrigation season.
The highest reading in the whole series is 95.3 %, on 24 May 2016, and the lowest 28.7 %, on 5 December 2017. 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 5th demarcation of the 14 covered by the hydrological bulletin: its 7,602 hm³ account for 13.6 % of everything Spain can store in mainland reservoirs. Today it holds 3,715 hm³.
The 35 dams the hydrological bulletin tracks in the Duero basin, sorted by capacity. Linked names have their own page with the full record.
| Reservoir | Capacity (hm³) | Volume (hm³) | Fill | Δ week | Use |
|---|---|---|---|---|---|
| Almendra | 2,649 | 1,477 | 55.8 % | −3.9 | Hydropower |
| Ricobayo | 1,145 | 433 | 37.8 % | −5.7 | Hydropower |
| Riaño | 641 | 239 | 37.3 % | −0.6 | Irrigation / supply |
| Santa Teresa | 496 | 233 | 47.0 % | −1.2 | Irrigation / supply |
| Porma-(Juan Benet) | 318 | 122 | 38.4 % | −0.6 | Irrigation / supply |
| Barrios de Luna | 311 | 73 | 23.5 % | −0.3 | Irrigation / supply |
| Cernadilla | 255 | 38 | 14.9 % | −3.1 | Hydropower |
| Cuerda del Pozo | 249 | 128 | 51.4 % | −0.8 | Irrigation / supply |
| Aguilar | 247 | 99 | 40.1 % | −0.8 | Irrigation / supply |
| Saucelle | 181 | 176 | 97.2 % | +0.6 | Hydropower |
| Valparaíso | 169 | 159 | 94.1 % | +0.6 | Hydropower |
| Aldeadávila | 114 | 110 | 96.5 % | +4.4 | Hydropower |
| Irueña | 110 | 54 | 49.1 % | −0.9 | Irrigation / supply |
| Compuerto | 95 | 23 | 24.2 % | −1.1 | Irrigation / supply |
| Úzquiza | 75 | 46 | 61.3 % | −1.3 | Irrigation / supply |
| Camporredondo | 69 | 15 | 21.7 % | +0.0 | Irrigation / supply |
| Villalcampo | 66 | 63 | 95.5 % | +1.5 | Hydropower |
| Requejada | 59 | 33 | 55.9 % | −1.7 | Irrigation / supply |
| Las Cogotas | 58 | 22 | 37.9 % | +0.0 | Irrigation / supply |
| Linares del Arroyo | 54 | 20 | 37.0 % | −1.9 | Irrigation / supply |
| Casares de Arbas | 37 | 17 | 45.9 % | +0.0 | Irrigation / supply |
| Agavanzal, Nª Sª de | 36 | 35 | 97.2 % | +2.8 | Hydropower |
| Castro | 27 | 25 | 92.6 % | +3.7 | Hydropower |
| Puente Porto | 23 | 2 | 8.7 % | −4.3 | Hydropower |
| Arlanzón | 22 | 9 | 40.9 % | +0.0 | Irrigation / supply |
| Villameca | 19 | 2 | 10.5 % | +0.0 | Irrigation / supply |
| Águeda | 15 | 10 | 66.7 % | +0.0 | Irrigation / supply |
| Burgomillodo | 14 | 8 | 57.1 % | −14.3 | Hydropower |
| Cervera | 10 | 9 | 90.0 % | +0.0 | Irrigation / supply |
| Rábanos | 8 | 8 | 100.0 % | +0.0 | Hydropower |
| Pontón Alto, El | 7 | 5 | 71.4 % | +0.0 | Irrigation / supply |
| San José | 6 | 6 | 100.0 % | +0.0 | Irrigation / supply |
| Serones | 6 | 6 | 100.0 % | +0.0 | Irrigation / supply |
| Villagonzalo | 6 | 6 | 100.0 % | +0.0 | Irrigation / supply |
| Vencías, Las | 5 | 4 | 80.0 % | −20.0 | Hydropower |
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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.
