State · United States · USGS · BOR · USACE · CDEC
Massachusetts
82.2% average fill
Measured
2
Volume stored
1,485 hm³
Measured capacity
1,806 hm³
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Reservoirs
Sorted by capacityQuabbin Reservoir
Updated 2026-08-01
Wachusett Reservoir
Updated 2026-08-01
Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.
About reservoirs in Massachusetts
As of August 1, 2026, the reservoirs we track across Massachusetts that report live levels hold roughly 1,485 hm³ of water — about 82.2% of their combined capacity. Taken together, Massachusetts's reservoirs are high.
None of the tracked reservoirs are currently at critically low levels. Wachusett Reservoir is the fullest at 92.6%, while Quabbin Reservoir is the lowest at 80.6%.
Storage figures for Massachusetts come from USGS · USACE · BOR · CDEC; the most recent reading is from August 1, 2026. Each reservoir below links to its own page with full history and seasonal context.
Massachusetts at a glance
- Reservoirs tracked
- 2
- Average fill
- 82.2%
- Water stored
- 1,485 hm³
- Combined capacity
- 1,806 hm³
- Fullest
- Wachusett Reservoir (92.6%)
- Lowest
- Quabbin Reservoir (80.6%)
- Last updated
- August 1, 2026
Frequently asked questions
How full are reservoirs in Massachusetts right now?
As of August 1, 2026, the reservoirs tracked in Massachusetts that report live levels are 82.2% full overall, holding about 1,485 hm³ of water.
How many reservoirs are there in Massachusetts?
reservoirs.earth tracks 2 reservoirs in Massachusetts, with a combined storage capacity of 1,806 hm³.
Which reservoir in Massachusetts is the fullest?
Wachusett Reservoir is currently the fullest reservoir in Massachusetts, at 92.6% of capacity.
Which reservoir in Massachusetts is the lowest?
Quabbin Reservoir is currently the lowest in Massachusetts, at 80.6% of capacity.
Where does the reservoir data for Massachusetts come from?
All storage figures for Massachusetts come from USGS · USACE · BOR · CDEC, an official source, last updated August 1, 2026.