Riaño
León · Castile and León · Duero
Capacity
641 hm³
Coordinates
42.973°N, 5.011°W
Operator
CHD
37.6% full
Current fill
37.6%vs 7 days ago
+0.3%gaining
vs 1 year ago
-2.2%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
103%of normal
37.6% full on 2026-10-13, against an average of 36.6% for October across 9 years of readings (+1.0 points).
Rain over the last three months · 21 September 2026
Near normal
In the three months to 21 September 2026 the area around Riaño had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −0.70). Rain, not storage.
EU drought indicator · 11 September 2026
Noneno drought signal
The European Drought Observatory's combined reading of rain, soil moisture and vegetation at this point. Watch means rain has been short, Warning that the soil has dried out, Alert that vegetation is visibly stressed; Recovery means the shortfall is easing. Ground conditions, not the reservoir's storage. Spain drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 641 hm³ |
| Usable capacity | 576.9 hm³ |
| Primary use | Multi-purpose |
| Operator | CHD |
| Province | León |
| Autonomous community | Castile and León |
| River basin | Duero |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.973, -5.011 · Open in Google Maps
About Riaño
As of October 13, 2026, Riaño is filled to 37.6% of its total capacity, holding roughly 241 hm³ of water out of a maximum 641 hm³. At this level the reservoir is low. Of that total, about 577 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.3 pts), and it is 2.2 points below its level on the same date a year earlier.
Across the readings we hold for Riaño — 418 data points between October 16, 2018 and October 13, 2026 — the level has ranged from a low of 26.1% (October 17, 2023) to a high of 95.5% (May 27, 2025). On average the reservoir is fullest around May and at its lowest around October.
It is operated by CHD primarily for multiple purposes. It lies within the Duero basin at 42.973°N, 5.011°W.
Key facts
- Current fill level
- 37.6%
- Water stored
- 241 hm³
- Total capacity
- 641 hm³
- Usable capacity
- 577 hm³
- 7-day change
- ▲ 0.3 pts
- Year-on-year
- ▼ 2.2 pts
- Primary use
- Multipurpose
- River basin
- Duero
- Operator
- CHD
- Coordinates
- 42.973°N, 5.011°W
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 37.6% | 241 |
| 6 Oct 2026 | 37.3% | 239 |
| 29 Sep 2026 | 37.9% | 243 |
| 22 Sep 2026 | 39.0% | 250 |
| 15 Sep 2026 | 40.1% | 257 |
| 8 Sep 2026 | 41.3% | 265 |
| 1 Sep 2026 | 43.2% | 277 |
| 25 Aug 2026 | 45.4% | 291 |
| 18 Aug 2026 | 49.5% | 317 |
| 11 Aug 2026 | 54.1% | 347 |
| 4 Aug 2026 | 58.5% | 375 |
| 28 Jul 2026 | 62.9% | 403 |