Riaño
León · Castile and León · Duero
Capacity
641 hm³
Coordinates
42.973°N, 5.011°W
Operator
CHD
41.3% full
Current fill
41.3%vs 7 days ago
-1.9%losing
vs 1 year ago
-3.3%year-over-year
7-day trend
↓falling
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 September 7, 2026, Riaño is filled to 41.3% of its total capacity, holding roughly 265 hm³ of water out of a maximum 641 hm³. At this level the reservoir is within its normal operating range. Of that total, about 577 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 1.9 percentage points, and it is 3.3 points below its level on the same date a year earlier.
Across the readings we hold for Riaño — 419 data points between September 4, 2018 and September 7, 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
- 41.3%
- Water stored
- 265 hm³
- Total capacity
- 641 hm³
- Usable capacity
- 577 hm³
- 7-day change
- ▼ 1.9 pts
- Year-on-year
- ▼ 3.3 pts
- Primary use
- Multipurpose
- River basin
- Duero
- Operator
- CHD
- Coordinates
- 42.973°N, 5.011°W
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 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 |
| 21 Jul 2026 | 67.9% | 435 |
| 14 Jul 2026 | 72.7% | 466 |
| 7 Jul 2026 | 77.4% | 496 |
| 30 Jun 2026 | 81.7% | 524 |
| 23 Jun 2026 | 85.6% | 549 |