Reservoir Watch
Real-time fill levels for 102 Brazilian hydroelectric reservoirs across 19 states. Data updated 3× daily.
Average fill
43.7%
Total volume
249 km³
Reservoirs
102
Critical
2
Low level
7
By ONS subsystem
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Brazil at a glance
National average fill
43.7%
249,418 of 571,021 hm³ stored
Reservoirs
102
States
19
Total capacity
571 km³
Volume stored
249 km³
Critical
2
Low level
7
National fill — multi-year
ONS subsystems
Click to exploreBy state
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São Paulo
19 reservoirs
Average fill
24.7%
Minas Gerais
19 reservoirs
Average fill
52.8%
Goiás
13 reservoirs
Average fill
43.4%
Pará
4 reservoirs
Average fill
71.3%
Paraná
11 reservoirs
Average fill
45.7%
Bahia
4 reservoirs
Average fill
67.5%
Amazonas
1 reservoirs
Average fill
45.5%
Tocantins
4 reservoirs
Average fill
19.9%
Mato Grosso
5 reservoirs
Average fill
33.1%
Rio Grande do Sul
6 reservoirs
Average fill
26.5%
Santa Catarina
5 reservoirs
Average fill
11.5%
Pernambuco
1 reservoirs
Average fill
27.7%
Rondônia
4 reservoirs
Average fill
51.6%
Piauí
1 reservoirs
Average fill
36.2%
Sergipe
1 reservoirs
Average fill
0.6%
Mato Grosso do Sul
1 reservoirs
Average fill
26.4%
Alagoas
1 reservoirs
Average fill
12.7%
Rio de Janeiro
1 reservoirs
Average fill
25.0%
Amapá
1 reservoirs
Average fill
25.9%
All reservoirs
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Dataset coverage
Tracked
102
reservoirs
With data
102
reservoirs
Tracked capacity
571,021
hm³
Source: ONS — Operador Nacional do Sistema Elétrico · ANA — Agência Nacional de Águas
Covers major reservoirs in the ONS hydrology monitoring system. Brazil has thousands more smaller reservoirs not yet tracked.
About reservoirs in Brazil
As of June 10, 2026, the reservoirs we track across Brazil that report live levels hold roughly 249,418 hm³ of water — about 43.7% of their combined capacity. Taken together, Brazil's reservoirs are within their normal operating range.
Across the region, 2 reservoirs are at critically low levels and 7 are low. PORTO PRIMAVERA is the fullest at 105.0%, while C.BRANCO-1 is the lowest at 11.2%.
Over the most recent week on record, 28 reservoirs rose and 31 reservoirs fell across Brazil.
Storage figures for Brazil come from ONS; the most recent reading is from June 10, 2026. Each reservoir below links to its own page with full history and seasonal context.
Brazil at a glance
- Reservoirs tracked
- 102
- Average fill
- 43.7%
- Water stored
- 249,418 hm³
- Combined capacity
- 571,021 hm³
- At critically low levels
- 2
- Fullest
- PORTO PRIMAVERA (105.0%)
- Lowest
- C.BRANCO-1 (11.2%)
- Last updated
- June 10, 2026
Frequently asked questions
How full are reservoirs in Brazil right now?
As of June 10, 2026, the reservoirs tracked in Brazil that report live levels are 43.7% full overall, holding about 249,418 hm³ of water.
How many reservoirs are there in Brazil?
reservoirs.earth tracks 102 reservoirs in Brazil, with a combined storage capacity of 571,021 hm³.
Which reservoir in Brazil is the fullest?
PORTO PRIMAVERA is currently the fullest reservoir in Brazil, at 105.0% of capacity.
Which reservoir in Brazil is the lowest?
C.BRANCO-1 is currently the lowest in Brazil, at 11.2% of capacity.
Where does the reservoir data for Brazil come from?
All storage figures for Brazil come from ONS, an official source, last updated June 10, 2026.