La Jarosa
Community of Madrid · Tajo
Capacity
7 hm³
Coordinates
40.668°N, 4.123°W
Operator
CHT
42.9% full
Current fill
42.9%vs 7 days ago
0.0%stable
vs 1 year ago
-14.2%year-over-year
7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 7 hm³ |
| Usable capacity | 6.3 hm³ |
| Primary use | Multi-purpose |
| Operator | CHT |
| Autonomous community | Community of Madrid |
| River basin | Tajo |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.668, -4.123 · Open in Google Maps
About La Jarosa
As of September 7, 2026, La Jarosa is filled to 42.9% of its total capacity, holding roughly 3 hm³ of water out of a maximum 7 hm³. At this level the reservoir is within its normal operating range. Of that total, about 6 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 14.2 points below its level on the same date a year earlier.
Across the readings we hold for La Jarosa — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 14.3% (October 15, 2019) to a high of 100.0% (March 9, 2021). On average the reservoir is fullest around April and at its lowest around September.
It is operated by CHT primarily for multiple purposes. It lies within the Tajo basin at 40.668°N, 4.123°W.
Key facts
- Current fill level
- 42.9%
- Water stored
- 3 hm³
- Total capacity
- 7 hm³
- Usable capacity
- 6 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 14.2 pts
- Primary use
- Multipurpose
- River basin
- Tajo
- Operator
- CHT
- Coordinates
- 40.668°N, 4.123°W
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 42.9% | 3 |
| 1 Sep 2026 | 42.9% | 3 |
| 25 Aug 2026 | 42.9% | 3 |
| 18 Aug 2026 | 42.9% | 3 |
| 11 Aug 2026 | 42.9% | 3 |
| 4 Aug 2026 | 42.9% | 3 |
| 28 Jul 2026 | 42.9% | 3 |
| 21 Jul 2026 | 42.9% | 3 |
| 14 Jul 2026 | 42.9% | 3 |
| 7 Jul 2026 | 57.1% | 4 |
| 30 Jun 2026 | 57.1% | 4 |
| 23 Jun 2026 | 57.1% | 4 |