CACHOEIRA CALDEIRAO
Amapá · ARAGUARI
Capacity
231.21 hm³
Coordinates
0.853°N, 51.297°W
Operator
ONS
97.8% full
Current fill
97.8%vs 7 days ago
-7.2%losing
vs 1 year ago
-1.1%year-over-year
7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 231.21 hm³ |
| Usable capacity | 231.21 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | ARAGUARI-AP |
| Province | Amapá |
| River basin | ARAGUARI |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 0.853, -51.297 · Open in Google Maps
About CACHOEIRA CALDEIRAO
As of July 28, 2026, CACHOEIRA CALDEIRAO is filled to 97.8% of its total capacity, holding roughly 226 hm³ of water out of a maximum 231 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 7.2 percentage points, and it is 1.1 points below its level on the same date a year earlier.
Across the readings we hold for CACHOEIRA CALDEIRAO — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 0.0% (May 15, 2026) to a high of 105.0% (September 5, 2025). On average the reservoir is fullest around February and at its lowest around May.
It is operated by ONS primarily for hydroelectric power. It lies within the ARAGUARI basin at 0.853°N, 51.297°W.
Key facts
- Current fill level
- 97.8%
- Water stored
- 226 hm³
- Total capacity
- 231 hm³
- 7-day change
- ▼ 7.2 pts
- Year-on-year
- ▼ 1.1 pts
- Primary use
- Hydroelectric power
- River
- ARAGUARI-AP
- River basin
- ARAGUARI
- Operator
- ONS
- Coordinates
- 0.853°N, 51.297°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 97.8% | 226 |
| 24 Jul 2026 | 105.0% | 243 |
| 17 Jul 2026 | 105.0% | 243 |
| 10 Jul 2026 | 94.5% | 219 |
| 3 Jul 2026 | 98.9% | 229 |
| 26 Jun 2026 | 105.0% | 243 |
| 19 Jun 2026 | 97.8% | 226 |
| 12 Jun 2026 | 41.5% | 96 |
| 5 Jun 2026 | 21.2% | 49 |
| 29 May 2026 | 3.6% | 8 |
| 22 May 2026 | 0.0% | 0 |
| 15 May 2026 | 0.0% | 0 |
Frequently asked questions
What is the current water level of CACHOEIRA CALDEIRAO?
As of July 28, 2026, CACHOEIRA CALDEIRAO is at 97.8% of its capacity, holding approximately 226 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is CACHOEIRA CALDEIRAO reservoir full?
CACHOEIRA CALDEIRAO is essentially full, sitting at 97.8% of capacity as of July 28, 2026.
Is the water level at CACHOEIRA CALDEIRAO rising or falling?
The level at CACHOEIRA CALDEIRAO is falling — it dropped 7.2 percentage points over the latest week on record.
How much water can CACHOEIRA CALDEIRAO hold?
CACHOEIRA CALDEIRAO has a total capacity of 231 hm³.
Where is CACHOEIRA CALDEIRAO reservoir located?
CACHOEIRA CALDEIRAO is located in Amapá, Brazil, within the ARAGUARI basin (coordinates 0.853°N, 51.297°W).
What is CACHOEIRA CALDEIRAO used for?
CACHOEIRA CALDEIRAO is used primarily for hydroelectric power, and is managed by ONS.